One thing that was always pressedinto my head is DO NOT TOUCH.
Do not touch another's stuff without permission, unless it is A) in danger of being broken (Falling off the table),

in the way, or C) in an area of items you know are being moved with the persons' knowledge.
Some people can be INCREDIBLY sensitive about touching their things. I know one young man who is very close to his bow and is not so much protective or worried about you breaking it, but simply connected to it. Its a beautiful peice, handmade for him and it means much to him. He is a very sweet man and means no harm, its just precious to him.
So unless offered or in the above circumstances, hands off! (accidents are understandable though, such as accidentaly grabbing the wrong plate and then putting it back down).
One thing I'm trying to find is HOW you curtsey. IS there any good period SCA approved instructions for that? I havent' found much and 'crouch knee bending' curtseys feel awkward. But bows do not feel right for a Lady (at least, this lady!)