I Feel Pretty

The Game

Solution

The person on the ground was instructed to meet one of Joker's "representatives" and tell them "I feel pretty," upon which they were given a clown makeup kit (and instructions with a photography waiver) and proceeded to make up their faces in the style of the Joker.

In regards to the online puzzle, when players clicked on the record player, the following sound file could be heard:

It was deduced that the long/short laughter pattern represented Morse code, with the following message:

Translated, the password was mountebank