Nursing a Smithwick's at a pub in Dublin sounds cheery, doesn't it?  But unless you're one of the few to have received a year-end bonus, it's not a dream that's likely to come true anytime soon. A little imagination, though, can help. Tonight, Seneca, an indie-rock group from Limerick, Ireland, plays the Walnut Room. With a Harp in hand, listening to the Tom Waits and Jeff Buckley-inspired foursome croon, Dublin shouldn't feel too far away. Thu, Apr. 9, 8:30 p.m. The Walnut Room, 3131 Walnut St. 303-292-1700, $9