Hypothetical Situation

Let's suppose for a moment that there existed a hypothetical Christian Community in an urban area. And let's add to this community the desire among community members to take communion together. And let's add to this desire a number of United Methodists, among others (Let's throw in some UCC, pentacostals, etc.). Mix all this up and this question comes out: is it appropriate for a "mixed" community to invite their United Methodist minister to come and serve the community communion? Why or why not?