I think this is not possible but a customer of mine is asking I cannot find anything related to this topic so

Is it possible to only accept Contacts on WhoId Event field as default?



You cannot filter that lookup sadly the best you could do would be a validation rule where ID must start with "003"

LEFT( WhoId , 3) = "003"

This would be an example this would stop someone from saving the event at least.

  • For anyone reading who needs context, the first three digits of an ID indicate the object type - "003" indicates a contact. Jan 14 at 12:30

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