The schedule should already make it very clear when the main cosplay show and its rehearsal are. Look at the schedule and you will have your answer.
Hall cosplay is not a show contest, as was made clear in the rules, therefore it does not have a set time, though rewards are announced at the main cosplay contest, so if you enter, you'll want to make certain you are in attendance. Because of that, it accepts entries the entire time the sign ups are open, on both Friday and Saturday.
As is stated in the rules, for hall cosplay, you are literally judged on the spot, along with a few photos taken as well for reference during further judging to be done later when the judges confer to determine the winners.
Also, yes, original designs are accepted in both contests.






