Automate Google Calendar SMS Reminders with RCSZilla

Automatically send SMS reminders to your customers for tomorrow's Google Calendar appointments using RCSZilla's powerful messaging platform. This n8n workflow streamlines appointment communication for service businesses by checking your calendar daily and sending consent-based reminder messages without requiring a separate SMS gateway provider.

What This Workflow Does

• Runs daily at 09:00 to check tomorrow's Google Calendar events
• Extracts phone numbers and SMS consent signals from event descriptions
• Creates concise reminder messages including event title, date/time, and location
• Queues SMS messages through RCSZilla's community node integration
• Skips events without phone numbers or missing SMS consent confirmation
• Routes ineligible events to summary node for testing and inspection

Perfect Use Cases

Ideal for service businesses managing appointments in Google Calendar: salons, dental clinics, medical practices, consulting firms, repair shops, real estate teams, and auto service centers. Perfect for businesses wanting simple SMS automation without complex third-party SMS gateway management.

Key Requirements

• n8n Cloud or self-hosted n8n instance
• Active RCSZilla account with API token
• Google Calendar OAuth credential configured in n8n
• Community node package: n8n-nodes-rcszilla installed
• Calendar events formatted with customer phone numbers and "SMS consent: yes" in descriptions

Technical Implementation

Built using essential n8n nodes including Schedule Trigger for daily automation, Google Calendar integration for event retrieval, IF nodes for consent validation, Code nodes for message formatting, and the RCSZilla community node for SMS delivery. Sticky notes provide clear workflow documentation and setup guidance.

This workflow ensures GDPR-compliant, consent-based SMS marketing while reducing no-shows and improving customer communication. The automated system respects customer preferences by only sending messages to contacts who have explicitly opted in to SMS reminders.