Free wine tastings this weekend at Taste Food and Wine (Rogers Park) and Just Grapes (downtown) focus on spring varieties. Tonight from 6 to 7:30 PM, Taste will be pouring rosés from France, Portugal, Spain, South Africa, and the U.S. Tomorrow from 1 to 4 PM Just Grapes will serve light, crisp wines, including a chenin blanc from Vouvray, a dry Austrian Riesling, an Oregon pinot noir, and a Shiraz rosé from southern Australia.