I know they said we can only come every 2 weeks. If I came on a Sunday, can I come again on the Saturday before the second Sunday? In other words, 13 days instead of 14?

Yes. Just slip one weekend

Yes. You can go on a Saturday instead of a Sunday. Also know that they will be closed Sunday February 3rd for the Super Bowl.

Yes

Yes you just have to skip a week

If you come on a sunday, you have to skip a sunday, and then come on the sunday after. Every other Saturday or Sunday. Meaning that between visits, you have to skip a week.