Send a message to all the Yes RSVPs for the write-in to say we moved to the Library.
[IN:SEND_MESSAGE Send a message to [SL:RECIPIENT [IN:GET_EVENT_ATTENDEE [SL:AMOUNT all ] the Yes RSVPs for [SL:CATEGORY_EVENT the write - in ] ] ] to say [SL:CONTENT_EXACT we moved to the Library ] . ]