than the times on the official Olympic schedule?

My Basketball tickets say August 3rd at 5:15 p.m. (17:15) but when I look at the official Olympic schedule there are no games at 5:15 p.m.

Only games are at 1:00 p.m. and 9:15 a.m. that day.

My track and field tickets say August 4th at 6:30 p.m. (18:30) but the official Olympic schedule says the only scheduled times for the three events that day are at 11:50 a.m., 12:30 p.m., and 1:50 p.m. (Men's 100 meter final.)

Any ideas what's going on?