If you live in the New England area, or most specifically the Boston area, I would highly recommend joining the Samuel Adams and Harpoon Brewery email lists.
At least once monthly, you'll get the "What's on Tap" email from Andrew & Bert telling you what's new in the world of Samuel Adams and the Boston Beer Company. The emails also include information on contests such as the Long Shot American Homebrew Contest, the Beer of the Month, as well as the dates of their monthly Open Houses.
Harpoon Brewery, which has locations in both Boston, MA and Windsor, VT (both great places, we've visited both) offers a monthly Friends of Harpoon eNewsletter. Also sent at least once monthly, Adam Bailey from Harpoon sends out an awesome email, letting you know what's happening at each brewery, events happening in the community, as well as contests and discounts offered only to Friends of Harpoon.
So if you haven't done so, visit both the Samuel Adams website, as well as the Harpoon Brewery websites today to sign up! You should also visit our Upcoming Beer Events page to find out some awesome events that are not to be missed.