Generate Smart Calendly Notifications for Outlook and Slack using GPT-4

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Built by Robert Breen Robert Breen
Created on June 05, 2026

Description

This n8n automation notifies you whenever someone books a meeting with you via Calendly. It sends a customized email via Outlook and a Slack message using details from the event.

๐Ÿ“Œ What This Workflow Does

Listens for new Calendly meeting bookings (invitee.created).
Extracts key details (name, email, reason for meeting, start time).
Uses an AI agent to generate both:
A HTML email sent to you via Outlook.
A Slack message sent to your chosen channel.

โš™๏ธ Step-by-Step Setup Instructions

1. ๐Ÿ”— Calendly API Setup
In n8n: Go to Credentials โ†’ Add Credential โ†’ Calendly API.
Connect your account with the personal access token.
In the Calendly Trigger node, set event to invitee.created.

2. ๐Ÿ“ง Microsoft Outlook Credential
Add Microsoft Outlook credentials via OAuth2 in n8n โ†’ Credentials.
Select it in the "Send a message" node.

3. ๐Ÿ’ฌ Slack Setup
Add Slack OAuth2 credentials.
Select your Slack workspace and choose the channel (e.g., #leads).

4. ๐Ÿง  Configure the AI Agent (OpenAI)
Provide your OpenAI API key under Credentials โ†’ OpenAI API.
The AI Agent node is pre-configured to:
Format a custom Slack message
Format a custom Outlook HTML email

5. ๐Ÿ›  Node Details
Calendly Event** (Trigger): Listens for new bookings
Edit Fields**: Extracts values like name, email, start time, and form answers
Email Generator** (AI Agent): Creates formatted email + Slack message
Send a message** (Outlook): Sends the formatted email to your inbox
Slack Message**: Sends the AI-generated Slack alert

๐Ÿงช Example Output

Slack Message:

Nodes Used (5)

AI Agent
@n8n/n8n-nodes-langchain.agent
Microsoft Outlook
n8n-nodes-base.microsoftOutlook
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Slack
n8n-nodes-base.slack
Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured