Smart WhatsApp Reminders to Maximize Event Attendance

Events are one of the most effective ways to gather highly engaged leads. However, even interested participants often forget to attend due to busy schedules or lack of calendar integration. As event organizers, we already had access to a valuable database of potential attendees, some of whom were high-quality leads. We noticed a recurring issue: most people didn't add the event to their calendar, resulting in low attendance rates.

To address this, I proposed and implemented a reminder system via WhatsApp, the most widely used communication platform in LATAM. The solution allows organizers to:

• Create multiple reminder variations per event
• Send automated WhatsApp messages to participants
• Use A/B testing logic during the invitation phase — the system tracks performance of each message and automatically selects the best one
• Embed UTM parameters in messages to enable conversion tracking and detailed analytics

From idea to launch, the full solution — backend and frontend — was designed and implemented in just two weeks, using QStash for scheduled message delivery and 2Chat as the WhatsApp API provider.