I am trying to say if campaign names are equal to certain names, then change from registered to attended, otherwise just put the results of the field. The issue is that the field is a picklist so getting that error. This is what I have so far.
IF(OR(Campaign.Name == "Virtual Summer Camp Session #1", Campaign.Name == "Virtual Summer Camp Session#2"), ISPICKVAL(CampaignMember_ContactOrLead.Camper_Status__c,"Registered"), ISPICKVAL(CampaignMember_ContactOrLead.Camper_S, )
Not sure what to put for the else part of the if statement.