tours + scheduling

I am arranging some tours for us in the coming weeks. One of them, it looks like, will have to be on a Sunday, but probably not until next month.

The other two are going to be during class time, but in order to get to the sites on time, we will have to leave no later than 4:20. The best possible dates are 10.2, 10.9, 11.13. Does anybody have a major restriction on those days that would keep you from leaving from campus at 4:20 (or meeting us at the sites at 5pm)?

if so please leave a comment here. thanks.