Liquor store wine tastings are a little like getting lunch at a grocery store sample day, though I can't tell if it's more classy (you're drinking wine) or less (you're getting drunk).
The Strib had a nice roundup of free wine tastings at liquor stores around the metro. I thought I'd add a few recommendations on where to get dinner afterword:
Surdyk's: 11 a.m.-6 p.m. Fridays and Saturdays. Fugaise
Solo Vino: 5-7 p.m. Fridays. La Grolla
France 44: 4-7 p.m. Fridays and 1-6 p.m. Saturdays. Convention Grill
The Little Wine Shoppe: 4:30-7:30 p.m. every other Wednesday. Muffuletta's
Sorella: 2-8 p.m. Fridays and Saturdays. Spoonriver