I think a hot dog bar is super creative (although I doubt it'll be all that inexpensive once all the clever toppings are bought!) and lots of fun. People who don't want a hot dog can fill their bun with chili and onions, roasted veggies or whatever. I doubt that the hot dogs are actually mandatory! If the OP buys a sleeve of those paper "boats" like you get at ball parks, that would up the nostalgia factor, too, making it even more festive.
Here's a blog post outlining what one family did - I'd love to go to a party that like! (also: here is a link to a caterer's page outlining a hot dog bar, along with the list of their very fun toppings.)
As for the rest, when it comes to hospitality I figure that if a prospective guest cannot graciously accept what is offered in the spirit in which it is presented then he or she ought to rethink accepting the invitation and maybe spend some time pondering why the presence of hot dogs at an event outweighed the opportunity to spend time with friends in celebration.
Here's a blog post outlining what one family did - I'd love to go to a party that like! (also: here is a link to a caterer's page outlining a hot dog bar, along with the list of their very fun toppings.)
As for the rest, when it comes to hospitality I figure that if a prospective guest cannot graciously accept what is offered in the spirit in which it is presented then he or she ought to rethink accepting the invitation and maybe spend some time pondering why the presence of hot dogs at an event outweighed the opportunity to spend time with friends in celebration.