To recap, the tours run on Saturdays and Sundays in the North End, South End, Harvard Square, and Back Bay. The tours are led by knowledgeable wine ambassadors. Each tour has three stops and includes multiple pours of wine as well as some small bites to eat.
Not only can you take a tour but you can book a private event with City Wine Tours too. They do bachelorette parties and wine and cheese parties and can even work with you to plan a unique event. Visit the website for more information.
If you decide to book a City Wine Tour, you can use the code "DeliciousDishings" to get $10 off your tickets.
Full disclosure: City Wine Tours provided me and a friend with a complimentary tour and I am part of their incentive program.