When walking around at a star party, be careful when walking near equipment as there could be wires and cables lying on the ground. Many modern telescopes require power which is commonly run from car batteries or portable power packs. If you see someone doing astrophotography or CCD imaging, it is best to stay away from their area until their image is complete. Even small vibrations on the ground can affect image quality. Simply ask from a distance if they are imaging before approaching.
Astronomy is a great hobby and is a great way to spend warm summer nights.
A little courtesy and respect to fellow astronomers and visitors goes a long way.