Telegram to Google Calendar Appointments (Gemini) + Reminders

Telegram messages automatically become Google Calendar appointments—with 24-hour & 1-hour reminders

This n8n workflow turns incoming Telegram messages into Google Calendar events using a Google Gemini AI agent, logs bookings in Google Sheets, and sends Telegram reminders exactly 24 hours and 1 hour before—without duplicate sends.

What this workflow does

• Listens for new Telegram messages and extracts the chat ID and message text.
• Uses a Google Gemini AI agent to parse the message into structured appointment details: title, start/end time, location, and notes.
• Validates and completes details: if an end time is missing, it defaults to 60 minutes. If the date/time is missing or ambiguous, it asks the user on Telegram for clarification.
• Creates the appointment in Google Calendar once the required details are available.
• Logs the booking to a Google Sheets “Appointments” sheet, including the event ID and chat ID, and sends a confirmation back to Telegram.
• Runs every 15 minutes to review upcoming events within the next 25 hours and targets reminders roughly 24 hours and 1 hour away.
• Sends Telegram reminders and records each send in a Google Sheets “ReminderLog” to prevent duplicates.

Use cases

• Convert client messages in Telegram into scheduled consultations automatically.
• Collect appointment requests via Telegram and confirm bookings in Google Calendar.
• Reduce no-shows with automated 24-hour and 1-hour reminder messages.

Technical details

• n8n nodes/steps include: Telegram, Google Gemini, Google Calendar, Google Sheets, if, code, and a sticky note for workflow guidance.
• Authentication: Google OAuth2 for Google Calendar and Google Sheets; Telegram bot credentials for message trigger.
• Uses Google Sheets “Appointments” and “ReminderLog” to store event metadata and deduplicate reminders.