

How to Send Google Calendar Events to Slack with Zapier
Automatically post notifications to Slack when new meetings are added to your team's Google Calendar.
Steps and UI details are based on platform versions at time of writing β check each platform for the latest interface.
Best for
Teams that want simple calendar transparency with minimal setup and create fewer than 100 events monthly.
Not ideal for
Teams needing instant notifications or complex message formatting with rich Slack attachments.
Sync type
pollingUse case type
notificationReal-World Example
A 12-person marketing agency uses this to notify their #schedule channel whenever client calls are added to their shared calendar. Before automation, team members checked the calendar manually throughout the day and often missed last-minute client additions, causing scheduling conflicts and missed prep time.
What Will This Cost?
Drag the slider to your expected monthly volume.
Each platform counts differently β Zapier: 1 task per trigger. Make: 1 operation per module per record. n8n: 1 execution per run.





Prices shown for annual billing. Based on published pricing as of April 2026.
Estimated ROI
1000
min saved/mo
$583
labor value/mo
Free
no platform cost
Based on ~2 min manual effort per operation at $35/hr fully loaded labor cost.
Implementation
Before You Start
Make sure you have everything ready.
Field Mapping
Map these fields between your apps.
| Field | API Name | |
|---|---|---|
| Required | ||
| Event Title | summary | |
| Start Time | start_date_pretty | |
4 optional fieldsβΈ show
| Event Location | location |
| Attendee List | attendees |
| Event Description | description |
| Event Duration | end_date_pretty |
Step-by-Step Setup
Dashboard > Create Zap
Create New Zap
Start by creating a new automation in Zapier. This sets up the foundation for connecting Google Calendar to Slack.
- 1Click 'Create Zap' from your Zapier dashboard
- 2Name your Zap 'Calendar to Slack Notifications'
- 3Click 'Start with a Trigger'
Trigger > App Selection > Google Calendar
Set Google Calendar Trigger
Connect your Google Calendar account and choose the event trigger. This tells Zapier to watch for new calendar events.
- 1Search for 'Google Calendar' and select it
- 2Choose 'New Event' as your trigger event
- 3Click 'Continue' to proceed to account connection
Trigger > Account Connection
Connect Google Account
Authenticate your Google account to give Zapier access to your calendar data. Choose the right account if you have multiple.
- 1Click 'Sign in to Google Calendar'
- 2Select the Google account that has your team calendar
- 3Allow Zapier to access your Google Calendar
- 4Click 'Continue' after successful connection
Trigger > Calendar Configuration
Configure Calendar Settings
Select which specific calendar to monitor and set any filters. This ensures you only get notifications from the right calendar.
- 1Select your team calendar from the 'Calendar' dropdown
- 2Leave 'Search Term' blank to capture all events
- 3Click 'Continue' to save trigger settings
Trigger > Test
Test Calendar Trigger
Run a test to make sure Zapier can read events from your calendar. This validates the connection works properly.
- 1Click 'Test trigger' button
- 2Wait for Zapier to fetch a recent calendar event
- 3Review the sample data that appears
- 4Click 'Continue with selected record'
Action > App Selection > Slack
Add Slack Action
Set up Slack as the destination for your notifications. This defines what happens when a new calendar event is detected.
- 1Click the '+' button to add an action step
- 2Search for 'Slack' and select it
- 3Choose 'Send Channel Message' as the action event
- 4Click 'Continue' to proceed
Action > Account Connection
Connect Slack Account
Authenticate your Slack workspace to allow Zapier to post messages. Make sure you connect the right workspace.
- 1Click 'Sign in to Slack'
- 2Select your team's Slack workspace
- 3Click 'Allow' to grant Zapier posting permissions
- 4Verify the connection shows your workspace name
Action > Message Configuration
Configure Slack Message
Set up the channel and message format for calendar notifications. This determines where and how notifications appear in Slack.
- 1Select your target channel from the 'Channel' dropdown
- 2In 'Message Text', click the '+' icon to insert calendar fields
- 3Add: 'New meeting: [Summary] on [Start Date Pretty] at [Start Time]'
- 4Add attendees by inserting '[Attendees]' field below the main message
π¬ New entry: {{1.name}}
Email: {{1.email}}
Details: {{1.description}}Action > Test
Test Slack Action
Send a test message to verify the notification format and delivery. This ensures everything works before going live.
- 1Click 'Test action' button
- 2Wait for the test message to post to Slack
- 3Check your Slack channel for the notification
- 4Verify the message format looks correct
Zap Settings > Publish
Turn On Zap
Activate your automation to start receiving live notifications. Your Zap will now monitor calendar events continuously.
- 1Click 'Publish Zap' in the top right
- 2Toggle the Zap to 'On' status
- 3Add a test event to your calendar to verify it works
- 4Check that the notification appears in Slack within 5 minutes
Drop this into a Zapier Code step.
Copy this template{{summary}} β’ {{start_date_pretty}} β’ {{location}} β’ {{attendees__length}} attendeesβΈ Show code
{{summary}} β’ {{start_date_pretty}} β’ {{location}} β’ {{attendees__length}} attendees... expand to see full code
{{summary}} β’ {{start_date_pretty}} β’ {{location}} β’ {{attendees__length}} attendeesScaling Beyond 100+ events/day+ Records
If your volume exceeds 100+ events/day records, apply these adjustments.
Upgrade to Professional Plan
You'll need the 2-minute polling interval instead of 15-minute to keep notifications timely. The Starter plan's delay becomes unusable at high event volumes.
Add Event Filtering
Use Zapier's Filter step to exclude recurring events, private events, or events shorter than 15 minutes. This prevents notification spam from calendar clutter.
Batch Notifications
Consider using Zapier's Digest feature to group multiple events into a single Slack message sent hourly instead of individual notifications for each event.
Going live
Production Checklist
Before you turn this on for real, confirm each item.
Troubleshooting
Common errors and how to fix them.
Frequently Asked Questions
Common questions about this workflow.
Analysis
Use Zapier for this if you want the simplest setup and your team creates fewer than 100 calendar events per month. The Google Calendar integration is reliable and the Slack formatting options cover most notification needs without custom code. Skip Zapier if you need instant notifications - go with Microsoft Power Automate instead, which offers true real-time webhooks for calendar events.
This workflow uses 1 task per calendar event. At 50 events per month, that's 50 tasks total. The Starter plan at $20/month includes 750 tasks, so you have plenty of headroom. Make would cost $9/month for the same volume but caps you at 1,000 operations. N8n cloud starts at $20/month with 5,000 executions. Make wins on pure cost here by $11/month.
Make handles Google Calendar's all-day events better - it has a dedicated formatter that automatically detects and formats them properly. N8n gives you more control over the Slack message formatting with its JSON editor, letting you add rich formatting like buttons or attachments that Zapier doesn't support. But Zapier's guided interface means you'll have this running in 10 minutes instead of 30.
Google Calendar's API returns attendee lists as comma-separated email addresses, which looks messy in Slack notifications. You'll need to add a Formatter step to clean this up or filter out events with more than 5 attendees to avoid wall-of-text messages. Also, recurring events trigger separately for each occurrence - a daily standup will fire 30 notifications per month. Set up filters early or you'll flood your channel on the first business day.
Ideas for what to build next
- βAdd meeting reminders β Create a second Zap that sends Slack reminders 15 minutes before each meeting starts using a delayed action.
- βLog events to Google Sheets β Add a parallel action to track all calendar events in a spreadsheet for attendance reporting and meeting analytics.
- βFilter by event type β Enhance with filters to only notify for external client meetings or events longer than 30 minutes to reduce notification noise.
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