In my events you really do not have to do anything. Everything is optional and you will have plenty of choices on how to participate or not to participate in any given part. We also place a lot of emphasis on recognizing, honouring and expressing our personal boundaries.
If there is nudity in the event, this is explicitly indicated in the event description. This is done to practice love and acceptance of ourselves completely. Releasing shame, guilt and fear about our beautiful body. Nudity is never required to receive the full benefit of the event.