May 21- May 27, 2006 (All times Eastern) AMA Superbike Championship presented by Parts Unlimited (Race 1), Infineon Raceway, Sonoma Calif., Sunday, May 21, 1 p.m. (SPEED) AMA Superbike Championship presented by Parts Unlimited (Race 2), Infineon Raceway, Sonoma Calif., Sunday, May 21, 11 p.m. (SPEED) Pro Honda Oils Supersport Championship presented by Shoei, Infineon Raceway, Sonoma, Calif., Tuesday, May 23, 1 p.m. (SPEED) AMA Superbike Championship presented by Parts Unlimited (Race 1), Infineon Raceway, Sonoma Calif., Sunday, May 23, 2 p.m. (SPEED) AMA Superbike Championship presented by Parts Unlimited (Race 2), Infineon Raceway, Sonoma Calif., Sunday, May 23, 3 p.m. (SPEED) Lockhart-Phillips USA Formula Xtreme Series, Infineon Raceway, Sonoma, Calif., Tuesday, May 23, 5 p.m. (SPEED) Amp’d Mobile AMA Supercross Lites Shootout, Sam Boyd Stadium, Las Vegas, Nevada, Tuesday, May 23, 11 p.m. (SPEED) AMA Toyota Motocross Championship presented by FMF (Motocross class), Hangtown Classic, Sacramento, Calif., Saturday, May 27, 6 p.m. (OLN) AMA Toyota Motocross Championship presented by FMF (Motocross Lites class), Hangtown Classic, Sacramento, Calif., Tuesday, May 29, 5 p.m. (OLN)