There will be plenty of politicians in the Mile High city next week, but maybe even more celebritiesWHO NEEDS bread and circuses when you've got networking and rock 'n' roll? For every Democratic delegate who is bound for the convention in Denver, desperate to influence the platform committee, there are plenty more looking for the best entertainment acts and the hottest parties -- and they'll have plenty of choices. As the politics have drained from our national conventions, high-level socializing, entertainment (with a purpose) and a chance to brush elbows with celebrities have become the real action at the quadrennial...