I’m thinking 5 pm on Friday is as good a time as possible - allows sane people to clear out before the rioting starts. A Monday morning release could trap a lot of 9-5 workers in the mess at evening rush.
Happy Hour in some bars start at 3:00 and goes till 7:00. They will be buzzing pretty good by 5:00pm and watching CNN to get the video!
Riot All Night Long!