The official start time is set for 1:30, though feel free to enjoy the park before hand (since I have no effective means of preventing it) or to join us later if necessary (even if I find a way to do so, I have no desire to prevent this).
As for bringing things, as long as it doesn't contravene any laws feel free to bring whatever you feel would be beneficial, enjoyable, and -regrettably necessary to say - safe. I doubt its worth your time and expense, Jeremy, but proceed as you will.