Naturally, I didn't have a camera, but EasyCure from our lovely forums did, so special thanks to him for the pictures of the museum.
Also, for anyone curious about the tournament, I had no idea what in the hell was going on. I think something went on, but I'm not quite sure what or how. It was pretty chaotic, even more so with the rain.
The museum had a lot of odd and cool relics from Mario's history, including the following:

Check out this awesome sweater that seems to have a tie to Mario Kart.

This work of art shows a lot of Mario's history, ranging from Wart to Dr. Mario to the Koopa Kids.

I missed the level in Super Mario Bros. 2 where you drove a car.

Rain would've known to stay the hell away from this poncho. At least I think it is a poncho.

This water-logged area didn't get much love during the event.

From the era where Mario characters didn't have defined visages. Look at weird gray Bowser.

I'm in this picture. Guess who I am.

I would've killed for this totally rad comforter as a kid.

Likewise with this lunch box.

There was a time where "Mario Bubble Bath" was a product. That must've been a fun time.

This might've been the reason why the Frog Suit hasn't returned.

The days of Nintendo-owned Nintendo Power featured such awesomeness as this.

For serious, when did Mario drive a car in Super Mario Bros. 2?!?
Check out other images here.
Once again, thanks to EasyCure from the NWR Forums.