Ok -- Row 2!
1-unknown with hat, 2-unknown, 3-unknown, 4-VERY unknown hiding with hat, 5-unknown woman in black, 6-unknown man with arms around gals, 7-Helen Hayes?, 8-unknown hiding, 9-unknown old guy, 10-unknown tan guy, 11-unknown bald guy, 12-unknown guy with badge, 13-Norma Shearer?/Una Merkel/Marion Davies?, 14-unknown with hat, 15-Bette Davis?/Marion Davies?/(someone else), 16-Tom Mix, 17-Lew Ayres?, 18-unknown, 19-Jean Harlow/Carole Lombard/Bette Davis?/Marion Davies?, 20-unknown guy, 21-unknown older woman with fab coat, 22-unknown with moustache, 23-unknown with hat, 24-Kay Francis