As always, your location may not be participating. Maybe you can check today so you won't be disappointed on Tuesday. So far I've seen or heard about these deals:
On Inauguration Day, get a free donut compliments of Krispy Kreme. Just head on in to any Krispy Kreme location for the donut of your choice on Tuesday. No coupon required.
I've heard radio commercials for TACO BELL saying they will be offering Taco's for .20 on Tuesday. I think the limit is 10 (maybe 20). Again, not sure if all locations will be participating.
Have you heard of any other great deals coming up?