"In game theory, a focal point (also called Schelling point) is a solution that people will tend to use in the absence of communication, because it seems natural, special, or relevant to them." https://www.wikiwand.com/en/Focal_point_(game_theory)

Come during the evening to hang out with other awesome people.

The location and date of the event is obvious.

Hint: it's a date between April 8th and April 21st.