Question:
How to Add More Fields To Appear In the Mass Update Attendee page In Event Management page?
Answer:
In order to achieve this, admin users need to enter list of fields in the MASS_UPDATE_ATTENDEE_FIELDS_vod Events Management Settings. This is a text field populated with the list of API fields names separated by comma (for example, Meal Opt In, Status) and cannot contain formula fields.
Related Documentation:
CRM Help Documentation: Mass Update for Attendees