BBs open on President's Day?

no, they're not open. but there will be people there. more likely at the junior level, less likely at the senior level. However, it really depends. the head of my office will be there, and so will my VP. so you bet your ass that most of the analysts/associates will be there. HR, on the other hand, will probably not.

mss2014, when did you get these offers? might you be able to extend?

Yeah, I just want someone who works there to put in a good word for me.

I already have an extension on my other offers.

HR won't be, but IBD will

Think of these kinds of holidays (Presidents' Day, Veterans Day, MLK Day, Labor Day, etc.) as extensions of the weekend: if you're cranking on a project or your team is in-office, then you've gotta be there, otherwise you're free to spend the day.

As far as your issue is concerned, you probably won't hear back on Monday as they wouldn't otherwise go out of their way to deliberate on these things with their precious weekend time.

Dude. Do not call everyone you know at the bank to demonstrate your interest, unless "everyone you know" is 1 or 2 people. If you call an entire group's worth of people, there is zero chance you will be hired because a) people will be annoyed as hell and b) you will be the laughingstock of the roundtable if they decide to give an offer to one of their "on hold" candidates.