Notify Attendees Instantly When Event Details Change
Changed the meeting time or location? Notis sends a contextual WhatsApp reply to attendees showing exactly what's different, so they don't get confused.
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
Send reply
Send a reply to a specific message in a whatsapp conversation. this creates a contextual reply that shows which message you're responding to. note: the reply will be delivered to the recipient only if they have texted first.
Why this helps
Updating a calendar event leaves attendees guessing what changed, so you end up re-explaining the same change across multiple channels.
- Crystal-clear updates: attendees see exactly what changed (time/place/attendees) without rereading the invite
- No confusion: a direct WhatsApp reply prevents people from attending the old time or place
- Less follow-up work: one automation replaces texting people individually about reschedules
Setup
Build it in a few focused steps.
- 1Confirm Google Calendar and WhatsApp business accounts are connected to Notis.
- 2Create a new automation: 'When I modify a calendar event, send attendees a WhatsApp reply message summarizing the change.'
- 3Select 'Event Updated' as your trigger.
- 4Pick your channel for run reports.
- 5Test by changing the time of an upcoming meeting and verify attendees receive a reply with the update details.
Questions about this workflow
Will Notis tell me which field changed, or just that something changed?
Notis can detail exactly what changed: 'Meeting moved from 2 PM to 3 PM' or 'Location changed from Room 5 to Zoom link: [URL]'. You control the level of detail in your automation prompt.
What if I update the event multiple times quickly?
Notis triggers on each update separately. If you make three changes in a row, attendees might see three reply messages. You can configure a delay (e.g., 'batch updates and send once per hour') if that's noisy.
Can I exclude certain updates from triggering notifications?
Yes. For instance, 'Send a notification if the time or location changes, but ignore changes to the description or attendee list.'
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Google Calendar to Whatsapp. A trigger fires from one place; an action lands in another.
Google Calendar triggers
Whatsapp 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.
Create message template
Create a new message template for the whatsapp business account. templates must be approved by whatsapp before they can be used. templates are required for marketing messages and messages sent outside the 24-hour window.
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.
Delete message template
Delete a message template from the whatsapp business account. this permanently removes the template and it cannot be recovered. only delete templates that are no longer needed.
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.
Get business profile
Get the business profile information for a whatsapp business phone number. this includes business details like description, address, website, and contact info.
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).
Get media
Get information about uploaded media including a temporary download url. the download url is valid for 5 minutes and can be used to retrieve the actual media file. this is useful for downloading media that was sent to your whatsapp number.
Event Created
Polling trigger that fires when a new calendar event is created. Returns event ID, summary, start/end times, and organizer info.
Get media info
Get metadata about uploaded media without generating a download url. this is useful for checking file size, type, and hash without downloading the file. use get media if you need the actual download url.
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).
Get message templates
Get all message templates for the whatsapp business account. templates are required for sending messages outside the 24-hour window and for marketing/utility messages.
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.
Get phone number
Get details of a specific phone number associated with a whatsapp business account.
Get phone numbers
Get all phone numbers associated with a whatsapp business account (waba).
Connect any two apps with Notis in the middle.
Not just Google Calendar and Whatsapp. Any combination from 985+ integrations.
When this happens · Trigger
Do this · Action
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