How do I convince my mom to take me to the rodeo?

We just got back yesterday from new mexico and i have been helping my mom unpack. The texas rodeo is The 12 - 27 and i really really want 2 go today. i have been helping my mom with EVERYTHING, because my dad got hurt on the vacation. We can't go tomorrow because she has a soccer game. The rodeo ends next saturday. I really want to go but how do I ask her and what should I do if she says no???