One of the Fourth Plinth Participants in London's Trafalgar Square brought along about 20 or more supporters, mostly dressed up in Marcel Marceau mode. Two are seen here.

Of course the girlfriend was one of them, and the plinther broke the rules and came down from the plinth after 45 minutes.

So he could propose to her...

http://www.oneandother.co.uk/participants/Martin_T

Photoshop:
Cropped and Resized
Boosted in Contrast