SalsaBoston sponsors Rueda classes and there are a number of teachers who teach those classes. If you want info on their schedule, go to SalsaBoston.com
M.I.T. has an active rueda group and the head of the group changes often with the end of the school year. Their website for information is: http://web.mit.edu/rueda/www/ and their email address is: email@example.com if you want to contact them for the schedule. It is open to non-MIT students.
Another group in Boston has the website: http://bostonrueda.wikispaces.com/ also does Casino Rueda. Go to their website for information/schedules.
Jenn Jonay teaches Casino Rueda in Worcester, Mass. Her phone is 6178234601 and her email to get her schedule is: firstname.lastname@example.org. The website for further info is: despelotedance.com