We have been going for over 2 years now. At our monthly Drupal meetups we get together to talk, share knowledge and exchange ideas. We often have a live speaker giving a talk. Sometimes we do a fairly informal sprint on a Drupal site at the pub. There is always free beer and pizza :)
The basic format of our meetups are as follows:
6:00pm - Registrations, free beer and other refreshments such as pizza.
7:00pm - Live speaker or open discussion (20-40 mins)
General Drupal Q&A for anyone attending (beginner through to advanced)
Update on progress of the group aims and any other general business
8:00pm - Pub!
Find out more information about the Drupal Yorkshire group, and previous meetups on our website, and follow us on Twitter.