Send WhatsApp Acknowledgments When Attendees RSVP
When someone says yes, let them know you saw it—on WhatsApp, instantly, without lifting a finger. Builds trust in a single message.
Trigger
Attendee Response Changed
Polling trigger that fires when any attendee's RSVP changes to accepted, declined, or tentative. Returns attendee info and current status.
Action
Send message
Send a text message to a whatsapp number. note: the message will reflect on the recipient's phone number only if they have texted first.
Why this helps
RSVP confirmations get buried in your inbox, so you end up manually messaging people back to confirm or thank them, multiplying the cognitive loop.
- Relationship building: attendees feel seen when you acknowledge their RSVP instantly
- No manual thank-yous: the automation frees you from sending repeat 'thanks for confirming' messages
- Asynchronous communication: works even if you're focused on other work when they respond
Setup
Build it in a few focused steps.
- 1Connect Google Calendar and WhatsApp business accounts to Notis.
- 2Create a new automation: 'When an attendee responds to a calendar event, send them a WhatsApp message saying thanks for confirming and include the event details.'
- 3Set the trigger to 'Attendee Response Changed'.
- 4Choose where Notis should report on successful sends (Telegram, email, etc).
- 5Verify by having a test attendee RSVP to an upcoming event and check WhatsApp for the acknowledgment.
Questions about this workflow
Can I send different messages based on whether they accepted, declined, or said maybe?
Yes. You can tell Notis: 'If they accepted, send this thank you. If they declined, send a follow-up asking if rescheduling would help. If maybe, send a nudge.'
Will this send acknowledgments for every calendar event or only certain ones?
By default, all events. You can filter by event type, time, attendee list, or any other detail using plain-language instructions.
What if someone doesn't have WhatsApp or their number isn't in the system?
Notis will skip that person and log the failure. You can see in your run reports who couldn't receive the message and why.
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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