well I'm actually not entirely sure how much cash I would need. I know I'd have enough for food and the ticket, but I would have to take a train (or bus I suppose) up there and I have no clue how much that would cost.
it only lasts two days (June 30th-July 1st), I'd probably try to arrive the day before (29th) and leave on third day or fourth (1st or 2nd). but again, the means of getting there and having a place to stay are bigger problems.