Performing at venues that your target audience frequents is fun. If you are a hip-hop chipper, do those hip-hop clubs etc. Don’t wait for an all chip event, cuz that day may never come.
Having said that, If you are fortunate to have other chippers around your hood, by all means join forces! It's good to show up in force to wake up the masses to the modern sound of chip today.
Its always a good idea to have a main site that people can go to for all your info. Sure you can mirror your band data on each music/networking site, but nothing beats a "official site" for fans to follow. This also helps with your "press release" emails, its easier to just list your main url rather than your laundry list of music/networking sites.
Also send emails to promote your latest "hot release" to the sites you frequent. Chances there are like minded folks there who may appreciate what you are doing. You'd be surprised how even some seemingly unrelated sites will post about your release.