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The Contact Filters have a criteria called Events Invited To
This lets you filter contacts according to the events they have been invited to
This could be used when
Sending broadcasts via SMS and Email, or when tagging contacts on Mailchimp Send a bulk SMS or Email to a group of contacts immediately or scheduled for later (i.e. send a Broadcast)
Sending unique survey links to contacts Send a unique survey link to a Contact (via Email, Manually or SMS)
The Timesheets App
If you use Event Timesheets, the timesheets app displays the time spent by each guest (and event worker) within each Event Role