When I failed in same races, wanted to check what that red marker is for, walked into it...and nothing happened...
So here is my little suggestion:
Can You make when
walk into this
red marker:
Los Santos Forum Stadium
Go there:
8-Track
and same for 2 others staduims
Las Venturas Blackfield Stadium:
-Kickstart and Dirt Track
San Fierro Stadium:
-Blood Bowl