Replying to Summer rail jam- ithaca ny

okay so heres the idea...
me, and a couple amigos are planning a rail jam. one possible location would be stewart park, in ithaca ny. we're trying to work something out with the city to make this work. we're also going to see if cayuga ski and cyclery would sponsor this event. the cost would be something like 9 dollars per person, with cash payouts for the winners. if this were to become a reality( in the late summer, early fall) how many of you would come?