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

Description

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