As you’re walking around the concourse this weekend, be sure to check out the THON Museum in the alcove outside Gate 31.

Spectators are invited to sign the 2015 THON Memories Museum Guest Book with a favorite memory from past dance marathons or answer the question: “Who do you THON for?” Even though the Bryce Jordan Center has only been open for a few hours, the memory book is already starting to fill up. So be sure to look through the book at some point over the weekend and add your own message.

And while you’re at the THON Museum, learn more about the history of the dance marathon. Do you know when THON broke the one million dollar mark? Or when THON moved to the White Building? There’s a detailed timeline that highlights the various changes that THON has undergone over the years. It begins with 1973, the first year of THON, and ends with 2014, where THON raised more than $13.3 million for the Four Diamonds Fund.

Also at the THON museum are newspaper front pages, Four Diamonds Family birthdays, and past THON Overalls’ memories from the 1970s, 2000s, and 2010s.

What is your favorite THON memory? Tell us in the comments below. And be sure to follow @THONwardState for comprehensive coverage over the duration of the weekend.