Multicultural weekend at different colleges?

I was wondering if applying to about 10 is too much? I know some colleges require you reimburse them if you do not accept to go. I’ve applied to Pomona, Carleton, etc. so far and some overlapped. For example: College A is from Oct. 10-13 but College B is from Oct. 11-13

Has anyone applied to any so far by the way?