There are a lot of wine tastings around the world throughout the year, but hands-down the best one is going on right now at the Carrousel du Louvre in Paris.
Le Grand Tasting showcases the best of French wines from all over the country. It is a chance to try Champagne alongside the best of Bordeaux (though bring some coffee for the Chateaux pouring from Bordeaux, many of them are just returning from the UGCB trip to Asia).
Tickets to the event are only 20€ (25€ on site). The event runs today and tomorrow from 10h30 to 20h30 (today) and 10h30 to 19h00 (tomorrow). If you are anywhere near Paris, definitely check it out!