Hello!
We (my daughter and I) mostly practice at our home arena. We are very blessed to have a 132X265 arena at our house with serviceable lights. The ground could be better, but hey, that's barrel racing.
But most arenas around our way (Central Texas) usually have exhibitions before a barrel race. And a lot of them have weeknight jackpots, so you can always get in that arena some time shortly before your run.
Hope this satisfies some of your curiosity.