You might expect a progressive happy hour to attract progressive people, but so far only businessmen seem to be taking advantage: Food and drink start cheap at 3:00 p.m. and climb a dollar each hour until the deal's over at 6:00 p.m. Beer and wine start at $2. Select cocktails (e.g., a cosmo with Finlandia vodka) and ample plates (e.g., beef sliders with caramelized onions and Gruyère) start at $3. If you can't make the afternoon, another happy hour starts at 9:00 p.m. (Union Square Grill, 621 Union St, 224-4321. 3—6 pm, 21+.)