If you have a job, it is okay to be out after curfew. Just make sure you go straight to and from work. Stopping to hang out with friends would mean breaking curfew.
Hanging out and breaking curfew can cost you. If you are caught after curfew, there is a fine of $109 and a mandatory appearance in court with your parents. You may also be required to do community service. Breaking curfew can also affect whether you can get or keep your driver's license.
Elm Grove Ordinance #190.1 for Curfew/Loitering from 11:00 PM - 5:00 AM. No person under the age of 17, shall congregate, loiter, wander, stroll, stand, play, or travel in or upon any public street or highway, road, alley, park, vacant lot, public building, place of amusement, or entertainment or any public place within the Village of Elm Grove, either on foot or in or upon any conveyance being driven or parked, unless you are with a parent, returning from a school, church, or work function, or any activity approved in advance in writing by parent ... See full ordinance Chapter 190.