As noted above there may be times when a facilitator has to touch you as a means of keeping yourself and/or other practitioners safe from harm, regardless of your stated boundaries. If you become disruptive or unsafe in ceremony a facilitator may make the judgment call to use touch to keep you and others safe from harm. It is rare this happens, and in case it does...
If you are not a "green" can you be explicit in how to deal with touching you for safety reasons? (ie, if possible, approach me from the front, not the side or behind, and if possible make eye contact with me, and narrate what you are about to do and why, like "I'm concerned you are going to fall and hurt yourself, so I'm going to move to your side and put my arm around you to keep you from falling)