I really want to attend this event, but making all 4 days is not an option for me. I’m willing to drive up early Friday morning, spending the night, and then leave early Saturday. Do they sell one day tickets on the day the event or do I need to do the full registration? Would it be possible for me to chip in for one night ($25-$35)? I have a sleeping bag and pillow, so I’d only need a spot on the floor.