Now, 400 isn't a large crowd, but still one might expect about 20 or 30 to be hanging around normally. So quite a few people would have come out for Charles and Camilla.

"Crowds greet royal couple in US."

"Charles and Camilla met the crowds on their tour of Philadelphia.

"The Prince of Wales and the Duchess of Cornwall were met with icy temperatures as they arrived in Philadelphia.
Charles followed in the footsteps of his great-great-grandfather Edward VII who toured the American city in 1860 when he was Prince of Wales.

"More than 400 people greeted the couple outside the city's Independence Hall."

Doesn't make a lot of sense to me. Yet.

Arf