You're targeting an extremely saturated market. Unfortunately the need for your app is already solved by something like Facebook or even just a group text e.g.

You're targeting an extremely saturated market. Unfortunately the need for your app is already solved by something like Facebook or even just a group text e.g. "2 dollar margaritas at 123bar, meeting there at 8, come on out". Ultimately the level of coordination and opt-in required by the friend group isn't really worthwhile for the mass market, you'll need to be a little more innovative to find some success, but the fact that you're disciplined enough to actually bring your ideas to fruition means its just a matter of iterating on your ideas till you build something more compelling.