how come at the wresteling match the people saw human 거미 spin webs and climb walls and take off his mask when he was spidey it didint occer to people that mabey that was the same person

Because people in 영화 never have common sence. Besides that was one little match, in New York City, no one would ever think to remember every guy who volunteers to fight to see if he might be a super hero later. It's New York City, now if it were a small town, then it would narrow it down a bit, but a small town is not a place for Spiderman.