Manage Calendar with Voice & Text Commands using GPT-4, Telegram & Google Calendar

This n8n workflow transforms your Telegram bot into a personal AI calendar assistant, capable of understanding both voice and text commands in Romanian, and managing your Google Calendar using the GPT-4 model via LangChain.

Whether you want to create, update, fetch, or delete events, you can simply speak or write your request to your Telegram bot — and the assistant takes care of the rest.

🚀 Features

• Voice command support using Telegram voice messages (.ogg)
• Transcription using OpenAI Whisper
• Natural language understanding with GPT-4 via LangChain
• Google Calendar integration:
  • ✅ Create Events
  • 🔁 Update Events
  • ❌ Delete Events
  • 📅 Fetch Events
• Responses sent back via Telegram

🛠️ Step-by-Step Setup Instructions

1. Create a Telegram Bot

• Go to @BotFather on Telegram.
• Send /newbot and follow the instructions.
• Save the Bot Token.

2. Configure Telegram Trigger Node

• Paste the Telegram token into the Telegram Trigger and Telegram nodes.
• Set updates to ["message"].

3. Set up OpenAI Credentials

• Get an OpenAI API key from https://platform.openai.com
• Create a credential in n8n for OpenAI.
• This is used for both transcription and AI reasoning.

4. Set up Google Calendar

• In Google Cloud Console:
  • Enable Google Calendar API
  • Set up OAuth2 credentials
  • Add your n8n redirect URI (usually https://yourdomain/rest/oauth2-credential/callback)
• Create a credential in n8n using Google Calendar OAuth2
• Grant access to your calendar (e.g., "Family" calendar).

⚙️ Customization Options

🗣️ Change Language or Locale

• The transcription node uses "en" for English. Change to another locale if needed.

✏️ Edit Prompt

• You can modify the prompt in the AI Agent node to include your name, work schedule, or specific behavior expectations.

📆 Change Calendar Logic

• Adjust time ranges or filters in the Get Events node
• Add custom logic before Create Event (e.g., validation, conflict checks)

📚 Helpful Tips

• Make sure n8n has HTTPS enabled to receive Telegram updates.
• You can test the flow first using only text, then voice.
• Use AI memory or vector stores (like Supabase) if you want context-aware planning in the future.