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Nadia AyoubNadia Ayoub 

number of attendees field

Anyone know how to create a formula field that displays the number of attendees linked to an event? Much appreciated!
Nithesh NNithesh N
What is the relationship between both objects? is it Lookup or Master-Detail?
 
Nadia AyoubNadia Ayoub
It's the standard relationship on the activity object.  Sorry it should have read number of "invitees"

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