Allen is probably a decent-enough guy; he just hasn't grown up to the idea yet that if a friend of his is doing something he wants to do, he can't automatically go along, too. Family life doesn't teach this; people are always included. And he's probably an extroverted and somewhat assertive individual who likes to assume that he's always welcome and, with the force of his expectation and assumption, actually gets included by people like you who don't want to make a fuss. It works for him to do this. He probably has a great future in sales.
Anyway, the only way to tell him no is to tell him no. Tell him what the trip is, why you'd feel uncomfortable about inviting him, and all the business you'd have to go through with other people to make it good, and how awkward it'd be. He's coming on like, "c'mon, invite me, it's no trouble, right?" But it is trouble.
You might have some hard feelings with him. But he'll get over them, maybe learn from them. And even if not, the next time you have something he want, he'll be around...
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