Re-engage event participants from HubSpot with Gemini and email outreach

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1. Workflow Overview

Event Alumni Re engager: HubSpot → Gemini → Personalized Outreach Who is this for? Event marketers and conference organizers who want to reactivate past attendees with AI personalized emails at 3 5...

Best for

Lead Nurturing automation workflows
Multimodal AI automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.manualtrigger, n8n-nodes-base.set, n8n-nodes-base.httprequest, n8n-nodes-base.code, n8n-nodes-base.if, @n8n/n8n-nodes-langchain.informationextractor, @n8n/n8n-nodes-langchain.lmchatgooglegemini, n8n-nodes-base.emailsend

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Milo Bravo.

Original n8n.io source

1.1 Workflow description

Title: Re-engage event participants from HubSpot with Gemini and email outreach
Workflow name: Re-engage event participants from HubSpot with Gemini and email outreach

Event Alumni Re-engager: HubSpot → Gemini → Personalized Outreach

Who is this for? Event marketers and conference organizers who want to reactivate past attendees with AI-personalized emails at 3-5x ROI vs. cold leads.

What problem is this workflow solving? Alumni gold is untapped:

Past attendees convert 3-5x better
Manual segmentation takes hours
Generic emails get ignored

This auto-segments + personalizes outreach from HubSpot data.

What this workflow does

CRM → AI Alumni Machine:

Trigger: Manual (or schedule 8-12 weeks pre-event)
HubSpot Pull: Past event_registration contacts
Smart Filter: Exclude current registrants
3-Tier Segments: Champions (3+ events) / Returning (2) / One-timers (1)
Gemini Personalization: Unique copy per attendee
Email Send: Alumni-exclusive CTAs
Slack Summary: Campaign stats posted

Main workflow required. This is a sub-workflow triggered by Event Registration with Auto-Enrichment

Setup (7 minutes)

HubSpot: Header Auth (Bearer YOUR_API_KEY)
Custom Property: event_registration (comma-separated event IDs)
Gemini: Flash Lite API key
Email: SMTP + Slack OAuth2
Config: Event details in Set Campaign Config

Fully configurable—no code changes needed.

How to customize to your needs

Segments: Add VIPs / Speakers / High-LTV
CRM: HubSpot → Salesforce → Sheets
Copy: Edit Gemini prompts for tone/industry
Channels: Add WhatsApp / LinkedIn
Timing: Cron for automated runs

HubSpot Setup: event_registration property auto-created by companion template.

ROI:

3-5x conversion vs. cold leads
60% lower CAC (alumni segment)
2h → 2min campaign launch

Need help customizing?: Contact me for consulting and support: LinkedIn / Message

Keywords: event participant re-engagement, conference registration, HubSpot automation, personalized outreach, conference marketing

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - Start Alumni Campaign

Type / Role: n8n-nodes-base.manualTrigger - manualTrigger
Config choices: Version 1

Block 2 - Set Campaign Config

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 3 - Fetch Past Attendees from HubSpot

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 4 - Filter Already Registered

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 5 - Has Eligible Alumni?

Type / Role: n8n-nodes-base.if - if
Config choices: Version 2.2

Block 6 - Segment Alumni by Engagement

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 7 - Generate Personalized Email with Gemini

Type / Role: @n8n/n8n-nodes-langchain.informationExtractor - informationExtractor
Config choices: Version 1

Block 8 - Google Gemini for Alumni

Type / Role: @n8n/n8n-nodes-langchain.lmChatGoogleGemini - lmChatGoogleGemini
Config choices: Version 1

Block 9 - Send Alumni Email

Type / Role: n8n-nodes-base.emailSend - emailSend
Config choices: Version 2.1

Block 10 - Log Alumni Outreach

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 11 - Post Campaign Summary to Slack

Type / Role: n8n-nodes-base.slack - slack
Config choices: Version 2.3

Block 12 - Intro — Alumni Re-engager

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 13 - Section 4 — AI Personalization

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 14 - Section 1 — Trigger & Configure

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 15 - Section 2 — Fetch & Filter Alumni

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 16 - Section 3 — Segment by Engagement

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 17 - Section 5 — Send & Log

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 18 - Section — Error Handling

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 19 - Contact — Braia Labs

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

3. Summary Table

Workflow	Re-engage event participants from HubSpot with Gemini and email outreach
Complexity	advanced
Nodes	19
Categories	Lead Nurturing, Multimodal AI
Author	Milo Bravo
Published	03 Mar 2026

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/13843/13843.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source Lead Nurturing workflows Multimodal AI workflows

Frequently asked questions

What does Re-engage event participants from HubSpot with Gemini and email outreach do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your Lead Nurturing, Multimodal AI use case.

Milo Bravo

14 workflows

Nodes

n8n-nodes-base.manualtrigger n8n-nodes-base.set n8n-nodes-base.httprequest n8n-nodes-base.code n8n-nodes-base.if @n8n/n8n-nodes-langchain.informationextractor @n8n/n8n-nodes-langchain.lmchatgooglegemini n8n-nodes-base.emailsend

Complexity

advanced

Published 03 Mar 2026

Likes 0

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Install path: /data/workflows/13843/13843.json

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Re-engage event participants from HubSpot with Gemini and email outreach

Workflow preview

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Event Alumni Re-engager: HubSpot → Gemini → Personalized Outreach

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - Start Alumni Campaign

Block 2 - Set Campaign Config

Block 3 - Fetch Past Attendees from HubSpot

Block 4 - Filter Already Registered

Block 5 - Has Eligible Alumni?

Block 6 - Segment Alumni by Engagement

Block 7 - Generate Personalized Email with Gemini

Block 8 - Google Gemini for Alumni

Block 9 - Send Alumni Email

Block 10 - Log Alumni Outreach

Block 11 - Post Campaign Summary to Slack

Block 12 - Intro — Alumni Re-engager

Block 13 - Section 4 — AI Personalization

Block 14 - Section 1 — Trigger & Configure

Block 15 - Section 2 — Fetch & Filter Alumni

Block 16 - Section 3 — Segment by Engagement

Block 17 - Section 5 — Send & Log

Block 18 - Section — Error Handling

Block 19 - Contact — Braia Labs

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions