With today's side deal, $20 gets you an intro to wine class at Sketch Wine Bar, a $40 value. Classes take place every Monday at 6 p.m., and students must RSVP by the Sunday prior to secure a seat.

Sample varieties of cheese and salumi while sipping and studying selections from Sketch's well-curated wine library. The Mediterranean-styled café houses more than 40 wines available by the bottle from all over the world. The intro to wine course covers a wide range of topics including grape varietals, the production process, and correct food pairings. Each session is overseen by a certified wine specialist who is well versed in all aspects of wine from production to pairing. Sketch's interior features a hand-painted ceiling, wooden beams, and hand-troweled Venetian plaster walls, which collectively set the stage for suitable sipping of wine and knowledge. Reservations are required, so call ahead to reserve a spot.

This Groupon expires on 9/30.

Reviews

Sketch Wine Bar was featured in 303 Magazine, The Denver Omelette, and 5280 magazine. Westword magazine named Sketch Wine Bar's Amarena cherries and chocolate one of its "100 Favorite Dishes," and Yelpers give it an average of 3.5 stars:

• Over all this is a really great place for a nibble and glass of wine with friends or dates. – Tiffany C., Yelp
• The food, drink and atmosphere at Sketch was the perfect end to a perfect night out. – Sandi D., Yelp