Throb gives you a combat suit (suitcase in your room) at some point. Sleep until curfew and interact with the suitcase in your room to put on the suit, then find Throb in front of the town hall.
The suit makes it so you can walk around freely during curfew.
You can get to curfew time by selecting 'wait until curfew' when sleeping in the bed.
Klaus will also have a surprise for you when you return from your patrol ;)