How do I add to an existing Slack channel?

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1. Create an event.
2. On the Guests step, choose Add to existing channel. 
3. Search for the existing channel in your Slack workspace that you want to add.
4. Employees will be automatically added to this Slack channel when they confirm into the event.

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Will guests be removed if they cancel their spot?

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No, they will not be automatically removed from the event's Slack channel. This is due to Slack's default settings for bot permissions (i.e. only workspace owners and admins are allowed to remove people from public channels).