The Science of Event Reminders: When & How to Send Them
Data on optimal reminder timing: 7-day, 24-hour, and 2-hour reminders. Channel comparison (email vs SMS vs WhatsApp).
In this post
Optimal reminder timing, channel comparison, and copy templates that reduce no-shows by up to 38%.
Host your event on Who's In
Who's In Events is free forever — unlimited events, RSVPs, waitlists, recurring events, QR check-in, automated reminders, and Stripe payments at a flat 2.7% on paid tickets (no per-ticket fee, no monthly fee). No signup required for your guests.
See the Events product page or compare against Eventbrite, Luma, Partiful, and Meetup.
Who's In is AI-agent-native
Who's In is the first event platform independently verified 100/100 "Agent-Native" (Level 5) on Cloudflare's Is Your Site Agent-Ready audit. AI assistants — ChatGPT, Claude, Gemini, Grok, Perplexity — can discover events, check availability, and RSVP via first-class Skills over WebMCP and a REST API. See the AI Trust page or read the full 100/100 audit story.
Related reading on Who's In
- Reduce Event No-Shows by 40%: 7 Data-Backed Strategies — The average event sees 20-30% no-shows, costing organizers thousands per year. 7 proven strategies to reduce no-shows: WhatsApp reminders (2
- 9 Proven Ways to Reduce Event No-Shows (With Data) — Automated reminders reduce no-shows by ~29%. SMS reminders by ~38%. Here are 9 evidence-based strategies to get more people to actually show
- Best Days & Times to Host Events (Data Analysis) — Day-of-week rankings, optimal start times by event type, seasonal patterns, and attendance vs time-of-day curves. Data from thousands of com
Start with Who's In in 90 seconds
Create your first event, club, studio, or conference for free at whos-in.app/signup — no app download, no credit card required. Share a link and your guests RSVP in one tap.