Trick-or-treating after the age of 15 usually meets disapproval, but donning a costume (or at least black and orange) and downing pumpkin-flavored delights has no age limit. For a hopping party this Halloween, stop by Parallel Seventeen [2] for a cirque-themed shindig, where pumpkin-spice ale takes the edge off the costume competition. Also tonight, Boulder's Mateo [3] serves a harvest supper, with acclaimed master sommelier Richard Betts [4] managing the wine pours. Saturday and Sunday, Centro [5] celebrates the international version of the holiday with its Dia de los Muertos cocktails, roasted pumpkin soup, and succulent rotisserie game hen. Parallel 17, 1600 E. 17th Ave., 303-399-0988 Mateo, 1837 Pearl St., Boulder, 303-443-7766 Centro, 950 Pearl St., Boulder, 303-442-7771