No reputable nudism provider allows bare skin on shared seating. If you go to their Halloween event, you must carry a towel to sit on. If the provider doesn't mention this, they aren't serious about hygiene.
Since traditional costumes aren't an option, the focus shifts to . Below is a draft for an event announcement or newsletter write-up. Title: Unmasking the Spirit: Our Halloween Bare-Bash! nudismprovider halloween
Could you clarify what you need? For example: No reputable nudism provider allows bare skin on