Post every new Calendly booking to a Slack channel
The team sees who booked, which event type and when, with the invitee's answers to your booking questions, without checking the Calendly dashboard.
Invitee CreatedSend Channel Message
Connect Calendly and Slack
Calendly fills the calendar, but the people who run the calls live in Slack. FlowMattic posts each booking to the right channel, tells the host when someone cancels, flags no-shows for sales and sends a list of the day's meetings every morning. Built for sales teams, agencies and coaches who share a calendar.
4 triggers 23 actions 8 example workflows 3 ready-made templates Unlimited runs
Try a pairing
When this happens in Calendly4 triggers
Do this in Slack14 actions
1. TriggerInvitee Created2. ActionSend Channel MessageWhen Calendly fires Invitee Created, FlowMattic runs Send Channel Message in Slack with the data from that event.
You build this in the FlowMattic workflow builder on your own site. See the setup steps
Calendly and Slack workflows you can build
Each one uses only triggers and actions the two integrations ship today, plus FlowMattic's own tools. Where the library has a ready-made template, import it instead of building from scratch.
Direct message the host when an invitee cancels
Find the host's Slack account by email and send them the cancellation with the reason the invitee gave, so they can reuse the slot or reach out.
Invitee CanceledFind User by EmailSend Direct Message
Flag no-shows for a follow-up in the sales channel
When a host marks an invitee as a no-show, the sales channel gets their name and email so someone tries to rebook them the same day.
Invitee No ShowSend Channel Message
Send routing form answers to the channel of the right team
A Router reads the routing form answers, such as region or company size, and posts each submission to the channel of the team that will take the call.
New Routing Form SubmissionRouterSend Channel Message
Open a Slack channel for each onboarding call
A Filter keeps bookings of your onboarding event type. A channel named after the client is created and the account manager is invited, ready before the call starts.
Invitee CreatedFilterCreate ChannelInvite User To Channel
Set a Slack reminder to prepare for each call
Add Reminder creates a Slack reminder for the host ahead of the meeting time, with the invitee's name and answers, so preparation does not depend on calendar pop-ups.
Invitee CreatedDate/Time FormatterAdd Reminder
Ready-made templateLet an AI agent write a pre-call brief for the team
The AI Agent reads the booking answers and the invitee's company, writes a short brief with talking points and posts it to Slack for whoever takes the call.
Invitee CreatedAI AgentSend Channel Message
View the template Post the day's scheduled meetings each morning
A Schedule trigger runs at the start of the day, List Scheduled Events pulls today's calls and one message lists them, so the team plans around the calendar.
ScheduleList Scheduled EventsIteratorSend Channel Message
More ready-made templates with both apps
Set up: new bookings posted to Slack
After these steps, each meeting booked through your Calendly links appears as a message in one Slack channel.
Connect Calendly
Under Connects in FlowMattic, add a Calendly connection with the account whose event types you want to watch.
Connect Slack
Add a Slack connection for your workspace and make sure the channel you will post to exists.
Start with Invitee Created
Create a workflow with the Calendly Invitee Created trigger, then book a test meeting so FlowMattic captures the invitee and event fields.
Write the message
Add Slack Send Channel Message, pick the channel, add the invitee name, event type, start time and answers, test it and switch the workflow on.
1. Trigger in Calendly
Invitee Created
-
2. Action in Slack
Send Channel Message
Fields mapped from the earlier steps (a typical setup)
From Calendly To Slack Invitee name Message: who Invitee email Message: contact Event type name Message: meeting Start time Message: when Questions and answers Message: notes
Triggers and actions in this pair
A trigger starts a workflow. An action is something FlowMattic does in the app as a step.
Good to know
- These workflows post to Slack, so a Slack message does not book or cancel a Calendly meeting. Every workflow here starts from Calendly or a Schedule.
- Calendly sends times in UTC. Use Date/Time Formatter to show the time in your team's time zone before posting it to Slack.
- Find User by Email only works when the host uses the same email in Calendly and Slack.
Triggers (4)
- Invitee CreatedTriggers when someone books a meeting
- Invitee CanceledTriggers when an invitee cancels an event
- Invitee No ShowTriggers when an invitee is marked as a no-show
- New Routing Form SubmissionTriggers when a new routing form submission is created
Actions (9)
- Create One-Off MeetingCreates a new one-off event type in Calendly (Note: Creates event type structure, not scheduled meeting)
- Mark Invitee as No ShowMarks a specific invitee as a no show
- Cancel EventCancels a scheduled event with a specified reason
- Find EventFinds an event based on UUID
- Search UserSearches for a User by name or email
- Get Current UserGet information about the currently authenticated user
- List Event TypesList available event types for a user or organization
- List Scheduled EventsList all scheduled events for a user or organization
- List Event InviteesList all invitees for a specific event type
Actions (14)
- Send Channel MessagePost or Schedule a new message to a specific #channel
- Add ReminderAdds a reminder for the user
- Create ChannelCreates a new channel
- List All ChannelsRetrieve list of all channels
- Set Channel TopicSets the topic on a selected channel
- Set StatusSets your Slack status to the given text and emoji
- Invite User To ChannelInvite an existing User to an existing Channel. You must be a member of the channel to invite someone to it
- Find User by EmailFinds a user by matching against their email instead of their username
- Find User by IDFinds a user by their ID.
- Send Direct MessageSend a direct message to a user or yourself from the Slackbot. Can also schedule a message for later
- Send Private Channel MessagePost a new message to a private channel you choose. Can also schedule a message for later
- Update ProfileUpdate basic profile fields such as name or title
- Find MessageFinds a Slack message using the Slack Search feature
- Upload FileUpload file to your slack workplace
Why run this pair with FlowMattic
Calendly and Slack connect through FlowMattic on your own site, with no separate automation account in the middle and no charge per run.
Invitee details stay on your server
Names, emails and booking answers pass from Calendly to Slack through your own WordPress site rather than another company's automation account.
Every booking, no task limits
Runs are unlimited, so a sales team with dozens of calls a day posts every booking, cancellation and no-show on the same plan.
One event type, one channel
Filters and Routers send demos, onboarding calls and support sessions to different channels, so each team reads only its own bookings.
Common questions
How do I get a Slack message when someone books on Calendly?
Start a workflow with the Calendly Invitee Created trigger and add Slack Send Channel Message. Map the invitee name, event type and start time into the message, test it with a real booking and switch it on.
Can I post only certain event types?
Yes. Add a Filter after the trigger that checks the event type name, so only demo calls, for example, reach the sales channel.
Can cancellations go to the host instead of a channel?
Yes. Use Invitee Canceled, look up the host with Find User by Email, then Send Direct Message. The cancel reason is in the trigger data if the invitee gave one.
Can I see tomorrow's or today's meetings in Slack?
Use a Schedule trigger with List Scheduled Events for the date range you want, loop over the results with Iterator or join them into one message, and post it with Send Channel Message.
Can a Slack message mark someone as a no-show?
Not from Slack with these workflows, which only post messages there. Mark Invitee as No Show can run from another trigger, such as a Webhook from your meeting tool.
Did not find your answer? You can browse the help center or ask us directly.
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Install FlowMattic, connect both accounts and import a template. Every run stays on your own server.
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Reviewed 27 Oct 2026. The example workflows are written with AI from the real triggers and actions of both integrations and checked against them. Calendly integration 1.0, Slack integration 1.0.