If you're looking for Open Source events to attend in your area (or just about anywhere around the world), check out this calendar as provided by Init Marketing with a great listing of happenings in over fifteen countries around the world.
Below calendar contains world-wide conferences and trade fairs related to Free and Open Source Software, IT and specific industries. It also shows events where you can meet with InitMarketing.
Countries included in the list are Germany, the US, Japan, Italy, Australia, China and many more. If you have an event that's not on the list and you'd like to see added, leave them a comment on that page and they'll get in contact with you.