Connecticut Open House Day is June 9th. If you're at all able to get to Connecticut, this is the day to come. Many of Connecticut's museums and historic sites will open their doors for free. Open House Day often features special events and new ways to learn about the state. In Wethersfield, a number of sites will be open. This is a great chance to learn about the town's history.
I wrote about the Wethersfield Historical Society in a December 2011 post. While the Society doesn't seem to have any special events planned, their buildings will be open. These include the Wethersfield Museum, a local home kept in the style of the early 1900s, and a warehouse reflecting the shipping trade.
The Webb-Deane-Stevens Museum consists of four historic homes on Wethersfield's Main St. Run by the Colonial Dames of Connecticut, the museum presents each of the home as a house museum reflecting a certain period of Connecticut life. If you can't visit, the website is rich in detail on each home and the individuals who owned it. The website hasn't been updated since mid-May, so the site's participation in Connecticut Open House Day is unclear.