I can only speak to the Metro Parking garage but the experience was so disappointing following a satisfying race.

If parking is free, why are you charging $10? This was reiterated several places on the website. Moreover, if parking is free, why are the exit stations closed?? Keep the arms up for the free parking period to allow traffic to flow freely. We didn't stay for the after party and left immediately after finishing. Apologies in advance for those who haven't left yet...