There's a 15% chance for a protest to occur that's rolled at 10AM on weekends.

Basically, here's a breakdown of the odds per weekend:
Odds of occurring on Saturday, but not Sunday: 12.75%
Odds of occurring on Sunday, but not Saturday: 12.75%
Odds of occurring on Saturday
and Sunday: 2.25%
Odds of not occurring at all: 72.25%
It only lasts for eight hours, so check between 10AM and 6PM.
