Beers are usually 4-6% alcohol per drink, most wine is 10-15% (ours usually average from 12-13.5% ) So you are AT LEAST doubling the alcohol, if you drink full glasses, and as fast as you would normally drink beer.
The wine tastings ARE to learn. The people who know more about wine are usually very willing to share their knowledge, at least that has been my experience. Tastings are always good because you can compare 3-4 different wines at the same time, not a bottle at a time, sips at a time

If you do go, tho, don't wear perfume/cologne it affects "the nose of the wine". Some wine experts can get offended, and even ask you to leave.