Okay, let's talk some JAILBREAK. I'm going to keep this simple and let you all run with it however you like. The basics - Dumbledore is sending in two teams of (up to) five. One team is strictly a diversion. They will draw the police and maybe even some of the wizard guards out in the street with some some sort of distraction - you can talk this out with each other and come up with whatever you like. The only restrictions are that muggles are NOT put in danger, including the ones with the guns. :P
The second team will have to find a creative way into the building. The jail has been charmed so that wizards cannot disapparate inside the building. There are also charms to notify the wizard guards of intruders (think alarms) and charms to keep the prisons in their cells (think magical backlash if you attempt to cast a spell at the bars). Rescuers have options, of course. They can come in through the roof, the ventilation system or heck, the front door once the diversion has begun. Magic may not work on the cells, but a key still does! You'll have to get past at least a handful of officers and guards though, as no diversion is one hundred percent effective.
Outside of these confines, the only thing set in stone is that four of the prisoners get out. Poor Rick Springfield gets nailed by a killing curse some time during the escape, for shame. :P The rest is up to you all. Post here to pick a team (DEs, Mi-X members and unaffiliated wizards can still jump in on the guard teams if they aren't already signed up as well). You can also post any questions here. Thanks for your patience, and Happy Rescuing! XD