I went last time Final Four was in Houston and had a great time. Met Hakeem, Earl Campbell, Grant Hill, Tom Izzo and also won free tickets to the final four that year. Great autograph and picture opportunity especially for kids. Entrance is free if you have a capital one card, Military, or meet other criteria listed on the overview page. Full schedule of events is below:

https://www.ncaa.com/mens-final-four/fan-fest#daily-schedule