Had a problem with some boneheads last year (long story short, friend lived in "their" neighborhood, didn't like my olive skin and dark hair. My anti-nazi patch probably didn't help much). Few tips that helped me.
1.) Always roll with at least three people.
2.) Snap blade box cutters, AKA Ratchet Knives. Cheap, easily concealed, quick action, easily excused("I use it at work") and getting cut by one hurts like hell, but unless you hit an artery, not fatal.
2.) Get yourself a fried hard drive(dumpster outside computer repair places) and rip out the magnet. Next, get a chain type dog leash. Attach magnet securely to the end of the chain. Wrap it around your waist, leaving a little to grab on to, using the magnet like a belt buckle. It's not much, but it's some kind of weapon, and it looks like a fashion accessory.
3.) Steel MUTHA-FUCKIN PIPE! Easy to conceal, packs a wallop, and if you gotta ditch it, small loss. A ball peen hammer is even better.
4.) Get a rep for being completely bat-shit crazy.
5.) Make friends with the people they hate most.
I would help with a plan, but I would need more intel. What kind of resources and manpower you have, roughly what kind of shit can they throw back on you.