CBS’ “Big Brother” delivered Thursday’s highest demo marks while NBC’s special Thursday edition of “America’s Got Talent” drew the largest crowd for any entertainment program on an otherwise ho-hum night.

NBC also led the broadcasters in live 10 p.m. coverage of President Obama’s nomination acceptance speech at the Democratic National Convention.

The 9 p.m. edition of “Big Brother” averaged 2.2 rating/6 share in the adults 18-49 demo and 6.1 million total viewers, according to preliminary ratings from Nielsen. In the lead-off hour, “America’s Got Talent” (1.8/6, 7.6 mil) delivered the Peacock’s largest non-Olympics aud in the time slot since March 15. That provided some lead-in heft to NBC’s 9-11 p.m. political coverage. (Ratings for the live coverage are subject to change when Nielsen’s finals are released later today, but NBC appears to have comfortable lead over the competish.)

ABC had an uphill climb for the night but still saw 8 p.m.’s “Wipeout” (1.3/4, 4.5 mil) grow by 1 million viewers vs. the previous week when it hit a series low. The Alphabet’s 9 p.m. drama “Rookie Blue” (1.2/3, 4.8 mil) wrapped its third season with a slight bounce from the previous week.

Fox fell under the 2 million viewer threshold for the night with reruns of “Raising Hope,” “New Girl” and “Glee” failing to muster much of an aud.

For the night (subject to change in the final nationals): NBC (2.0/6, 7.2 mil), CBS (1.6/5, 5.3 mil), ABC (1.1/3, 4.3 mil), Univision (1.3, 3.1 mil) Fox (0.7/2, 1.8 mil).