can you park in the horton plaza parking lot for the balboa theatre "So you think you can dance" event

You can also park at the Westin.

Yes. Parking for 2 hours with validation.

I did pay 20 when I went to a even at Balboa theater, it was last month

Idk, call around and ask maybe?

I believe that you can purchase parking online, it is more expensive to pay when you park. $10 vs. $28