Never Miss a Meeting Time or Agenda Change
When a meeting changes, you need to know. Notis sends a Slack alert with exactly what changed (time, attendees, or title), so you're never caught off-guard by a rescheduled call.
Trigger
Event Updated
Triggers when an existing Google Calendar event is modified. Returns the event ID, change type, and the specific fields that changed with their previous and new values.
Action
Create a reminder
Creates a slack reminder with specified text and time; time accepts unix timestamps, seconds from now, or natural language (e.g., 'in 15 minutes', 'every thursday at 2pm').
Why this helps
Meeting details often change in ways that get buried under other notifications. A founder focused on deep work can easily miss that a meeting moved 30 minutes earlier or that key attendees were added. This creates scheduling conflicts or missed context.
- Immediately catch time changes before you miss a rescheduled call
- Notice when key stakeholders are added or removed
- Update prep or cancel it if the meeting scope shrinks
- Reduce the cognitive overhead of manually monitoring updates
Setup
Build it in a few focused steps.
- 1Connect Google Calendar and Slack to Notis.
- 2In Automations, create a new automation called 'Event Change Alert'.
- 3Set the prompt: 'When any of my calendar events are changed or updated, send me a Slack alert with the event title and a summary of what changed (e.g., time moved from 2pm to 3pm, or 2 new attendees added).'
- 4Select 'Event Updated' as your trigger.
- 5Choose your Slack channel for change alerts.
- 6Test by having someone update an existing meeting on your calendar.
Questions about this workflow
Will I get alerted for small changes like adding a description?
Tell Notis in your prompt: 'Only alert me on important changes like time, attendees, or title. Skip description edits.'
What if I edit my own event?
Yes, you'll get a reminder too. This helps confirm what you just changed.
Can I ignore changes to specific meetings?
Tell Notis: 'Don't alert me on changes to focus time or recurring team standups.'
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Calendar to Slack. A trigger fires from one place; an action lands in another.
Google Calendar triggers
Slack actions
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
Set snooze duration
Deprecated: turns on do not disturb mode for the current user, or changes its duration. use `set dnd duration` instead.
Event Canceled or Deleted
Triggers when a Google Calendar event is cancelled or deleted. Returns minimal data: event_id, summary (if available), and cancellation timestamp.
Add a custom emoji to a Slack team
Deprecated: adds a custom emoji to a slack workspace given a unique name and an image url. use `add emoji` instead.
Event Starting Soon
Triggers when a calendar event is within a configured number of minutes from starting. Returns event details, time remaining, attendees, and join links when available.
Add an emoji alias
Adds an alias for an existing custom emoji in a slack enterprise grid organization.
Calendar Event Changes
**SOON TO BE DEPRECATED** - Use Calendar Event Sync (polling trigger) instead. Real-time webhook trigger for calendar event changes. Returns event metadata only. For full event data, use Calendar Event Sync (polling trigger).
Add a remote file
Adds a reference to an external file (e.g., google drive, dropbox) to slack for discovery and sharing, requiring a unique `external id` and an `external url` accessible by slack.
Event Created
Polling trigger that fires when a new calendar event is created. Returns event ID, summary, start/end times, and organizer info.
Add a star to an item
Stars a channel, file, file comment, or a specific message in slack.
Calendar Event Sync
Polling trigger that returns full event data including details, attendees, and metadata. For real-time notifications with basic info, use Calendar Event Changes (webhook).
Add call participants
Registers new participants added to a slack call.
Event Updated
Triggers when an existing Google Calendar event is modified. Returns the event ID, change type, and the specific fields that changed with their previous and new values.
Add emoji
Adds a custom emoji to a slack workspace given a unique name and an image url; subject to workspace emoji limits.
Add reaction to message
Adds a specified emoji reaction to an existing message in a slack channel, identified by its timestamp; does not remove or retrieve reactions.
Connect any two apps with Notis in the middle.
Not just Google Calendar and Slack. Any combination from 985+ integrations.
When this happens · Trigger
Do this · Action
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