In South Carolina, Gamecock games whenever they play at Williams-Brice against Clemson or any SEC East team other than Kentucky or Vandy are filled with the opponent's fans.
There's years where half the crowd is Clemson fans at that game. Georgia and Tennessee usually bring 10,000+ fans, sometimes more.
I have season tickets to College of Charleston basketball games; when we hosted UNC this year, who has a big fan base around here, I'd say 1/3 of my home arena (which seats 5,100) was filled with UNC fans.
We hosted Texas in baseball this year and more than 40% of the stadium (1,600 fans) were rooting for the Longhorns.
Nebraska, Dayton, and St. Bonaventure have big followings no matter where you go too. We have the Charleston Classic here and the years the latter two were in it, the arena was filled up with their fans even though they are small schools.
Bonaventure even brought students down to Charleston. Nebraska filled up half our stadium for a February baseball series a few years back.
SM-G998U