Can I get reminders further in advance?

Yes, increase the 15-minute window in the Filter Starting Soon code node.

Does it work for team/shared calendars?

Yes — just point calendarId at the shared calendar's ID instead of 'primary'.

Customer OperationsStructurally Validated

Calendar Meeting Slack Reminder

This automation checks your Google Calendar every 15 minutes and sends a Slack reminder for anything about to start — so you're never caught off guard between tabs, with no manual reminder-setting required.

Automation flow

Step 1

Every 15 Minutes

Checks your calendar on a regular schedule.

Step 2

Get Upcoming Events

Pulls your upcoming Google Calendar events.

Step 3

Filter Starting Soon

Keeps only events starting within the next 15 minutes.

Step 4

Send Reminder

A Slack message with the meeting name and link goes out.

How it works

Every 15 minutes, the workflow pulls your upcoming calendar events, then a filtering step checks which ones are about to start within that window. Only genuinely-imminent meetings trigger a Slack message — you won't get pinged repeatedly for the same meeting since it only matches once it falls inside the 15-minute window.

Services used

Google CalendarSlack

What you'll need

Free [n8n Cloud](https://n8n.io) trial or self-hosted n8n
Google account (Calendar)
Slack

What's included

Never miss a meeting between tabs again
Works with any Google Calendar, including shared/team calendars
Only pings once per meeting — no spam
Completely free — part of the Starter Pack

Estimate what this could save you

Times per week

Minutes each time

Your hourly value ($)

3.6 hours/month

≈ $108/month in your time

A rough estimate based on what you enter above — not a guarantee. Actual time saved depends on your process.

Works well with this automation

Candidate Interview Scheduler

Finds the first open slot on the interviewer's calendar within a candidate's availability window and books it automatically.

$15

Employee Time-Off Approval

Employees request time off via form; a manager approval in a sheet triggers an automatic calendar block and confirmation.

$15

Appointment Confirmation + Reminder

Adds Calendly bookings straight to your calendar, confirms instantly, and reminds clients 24 hours before.

$15

Questions about this template

Free

No account needed — the download link lands in your inbox instantly.

Structurally validated: automatically checked for valid n8n format before every deploy.

Difficulty: Easy
Setup time: ~10 min
Integrations: 2
Node count: 4
Format: .json + guide