Olmec Dynamics
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·7 min read

How to Sync ClickUp Tasks to Google Calendar Using Make.com and Slack

Sync ClickUp tasks to Google Calendar using Make.com, post Slack updates, and prevent duplicates with task-id event mapping. Step-by-step setup.

Introduction

If your team plans work in ClickUp but relies on Google Calendar for anything time-critical, the handoff is usually manual. Someone exports due dates or copies task titles into Google Calendar, then forgets to update when a task is rescheduled.

That creates avoidable issues: wrong-day meetings, missed prep time, and Slack messages from people who noticed the calendar drift. This is the exact kind of Cross-Platform Automation (XPA) that keeps your planning systems aligned.

By the end of this post, you will know how to build a Make.com scenario that syncs ClickUp tasks into Google Calendar and posts a Slack update when events are created or updated.

What You'll Need

  • ClickUp access to the Space/Folder/List where tasks live
  • Google Workspace access to the Google Calendar where you want events created
  • Slack access, plus a Slack app connection in Make.com with permission to post to your target channel
  • Make.com account
  • A target mapping field available in your Make.com trigger payload:
    • ideally the ClickUp task ID, plus task name, due date, and task URL
  • A place to store idempotency mapping:
    • Google Sheets is simplest for this “simple” build, create a small sheet tab called clickup_calendar_map

If you want the reliability patterns behind this kind of XPA, start with the Cross-Platform Automation (XPA) overview.

How It Works (The Logic)

When your Make.com scenario runs, it follows this flow:

  1. Trigger: a ClickUp event fires (task created or task updated)
  2. Guard: Make filters out tasks without a due date, and optionally filters out completed tasks
  3. Lookup: Make checks Google Sheets for an existing mapping from clickup_task_id to google_event_id
  4. Action:
    • if mapping exists, Make updates the same Google Calendar event
    • if mapping does not exist, Make creates a new Google Calendar event and stores the new google_event_id
  5. Slack: after the calendar action succeeds, Make posts a short message showing what changed

In short: ClickUp due date change → lookup in Sheets → create or update Google Calendar event → Slack notify.

Step-by-Step Setup

1) Create the Google Sheets idempotency ledger

In your Google Sheet, create a tab clickup_calendar_map with these columns:

  • clickup_task_id
  • google_event_id
  • last_synced_at

This sheet is your “no duplicates” guarantee. Every time Make needs to decide whether to create or update, it uses clickup_task_id.

2) Create a new Make.com scenario

In Make.com:

  1. Create a new Scenario
  2. Add the ClickUp trigger as the first module

For a simple and practical build, choose one:

  • Trigger on task creation if you only need events initially
  • Trigger on task update if you want due-date reschedules to update calendar events

3) Filter early in Make.com

Immediately after the trigger, add a filter module with at least:

  • Continue only if due date is not empty

Optional but recommended to reduce noise:

  • Continue only when task status is not Done (use your actual ClickUp status names)

This is how you keep your calendar clean. Without it, you create calendar events for drafts and completed tasks.

4) Lookup the existing Google Calendar event in Sheets

Add a Google Sheets search rows module:

  • Search column: clickup_task_id
  • Search value: map from ClickUp task_id

Now create a router:

  • Route A: mapping found, you have a google_event_id
  • Route B: mapping not found, you need to create a new event

5) Build the Google Calendar event fields

Before wiring up the calendar module, standardise your payload in your head:

  • Event title: {{task_name}}
  • Event description: include the ClickUp link for traceability
    • Example: ClickUp: {{task_url}}
  • Event start/end: derived from due date

Choose one simple strategy:

  • All-day events: set the event start to the due date, and mark it all-day
  • Timed events: set a fixed start time on the due date, for example 09:30, then set an end time

Gotcha to watch:

  • If you use timed events, make sure your Make.com date handling and timezone match what your team expects.

6) Route A, update the existing Google Calendar event

In the update branch:

  1. Add the Google Calendar: Update event module
  2. Use google_event_id from Sheets as the event identifier
  3. Re-map the fields:
    • title
    • description
    • start/end derived from the current ClickUp due date

After the update succeeds:

  • Add a small Slack step (see Step 8)
  • Update last_synced_at in the mapping sheet

7) Route B, create a new Google Calendar event

In the create branch:

  1. Add the Google Calendar: Create an event module
  2. Map the same fields (title, description, start/end)
  3. Capture the returned Google event ID from the create output
  4. Add a Google Sheets: Add row module to store:
    • clickup_task_id
    • google_event_id
    • last_synced_at

Then proceed to the Slack notification.

8) Post a Slack message for created or updated events

Add a Slack module that posts into your chosen channel, for example #project-updates.

Use a message like:

  • On create:
    • Created Google Calendar event for ClickUp task: {{task_name}} (due {{due_date}})
  • On update:
    • Updated Google Calendar event for ClickUp task: {{task_name}} (new due {{due_date}})

Include the ClickUp task link (and optionally the Google event ID).

9) Test like production, with duplicates in mind

Run these tests:

  1. Create a task with a due date
    • confirm exactly one Google Calendar event appears
  2. Change the due date
    • confirm Make updates the same event, not creates a second one
  3. Trigger a rerun scenario (or test a retry)
    • confirm the Sheets lookup routes you into update, not create

If you see duplicates, your clickup_task_id mapping is not stable. Fix the ledger key before turning this on broadly.

Real-World Business Scenario

A small consultancy uses ClickUp for delivery tracking, but their client-facing stakeholders live in Google Calendar. Before automation, a PM copied due dates into the calendar and adjusted manually when tasks moved.

After deploying this ClickUp to Google Calendar sync in Make.com with a Sheets ledger, reschedules updated the same calendar event. Slack confirmations made it easy to trust the system, and the calendar stopped drifting week after week.

Common Variations

  1. Sync only tasks from specific ClickUp lists or folders

    • Add a filter on list/folder ID or on a task custom field (if your trigger outputs it)

  2. Use due date as all-day events, start date as timed events

    • If your ClickUp tasks use both, create a timed event from start date and an all-day reminder from due date

  3. Post Slack only when due date changes

    • For task update triggers, compare old vs new due date fields if available in the trigger payload

Keeping your planning system aligned

You now have a simple ClickUp → Google Calendar sync in Make.com that:

  • creates events when a due-date task appears
  • updates the same event when the due date changes
  • prevents duplicates using clickup_task_id to google_event_id mapping
  • posts Slack messages after successful create or update

Olmec Dynamics builds these operational XPAs across delivery, scheduling, and CRM stacks. If you want this tailored to your ClickUp setup and your exact Google Calendar expectations, you can see what we do here.