That was easy wasn't it
The answer is
10,018 which is a serious amount of people.
A point if you said between 9,000 and 11,000
HNY
http://www.drpbusiness.com/uk/3120.php 6,836 Grand ballroom, Times Square, Radio City ballrooms, Columbus, Madison Avenue, Park Avenue, Wall Street, Roosevelt, Vanderbilt, Castle club, Suite 5244, Long Island, Manhattan, Brooklyn, 26 suites (2,500+2,500+720+150+150+80+12+18+18+80+50+30+30+30+(26*18))
NBC
http://www.drpbusiness.com/uk/3140.php 2,818 Ballroom, Providence, Bridgeport, Nantucket, Boardroom, Boston Clipper Cape May, Provincetown, Catalina, Portland, Connecticut, Massachusetts, Dockside, Pier I Pier II (2,500+22+75+60+40+8+8+75+30)
SL
http://www.drpbusiness.com/uk/3164.php 240 Buffalo, Coyote, Missouri River, Columbia River, Red River, Suite 7211 (60+60+35+35+35+15)
DLH
http://www.drpbusiness.com/uk/3154.php 124 Pinocchio, Dumbo, Bambi, Mary Poppins, Exec boardroom (50+30+20+12+12)
Total 10,018