In the Greater Boston area:
The Burren in Somerville, 7 night a week
Mon: Green Briar in Brighton
Tues: Druid in Somerville
Brendan Behan's & Finnigan's Wake (?)
Wed: McGann's in Downtown (?)
Mr. Dooley's in Downtown
Thur: Matt Murphy's in Brookline
Fri: Druid in Somerville
Pheonix Landing in Cambridge
Sat: Matt Murphy's in Brookline
Brendan Behan's in Jamaica Plain
Druid in Somerville
Green Dragon in Downtown
Sun: Druid in Somerville
Tir Na Nog in Somerville
Mr. Dooley's in Downtown
O'Leary's in Brookline
Green Dragon in Downtown

The ones with (?) I haven't heard of or been to recently, but I don't get around much anymore. The rest are ongoing on a weekly basis. These do not include the many sessions outside the Boston & immediate area. These are all usually well attended. Any where from 4-5 to I heard the Green Briar a week ago had upwards of 35, it wouldn't have been surprising to find there, I know Paddy Cronin & Larry Reynolds (& sons 1,2 or 3) & likely Seamus Connelly, Johnny Cunningham (beginning to sound like a fiddle session?), Joe Duranne(sp?), Bill Black, & I'm sure there where some that sat out & said the hell with it. Barry, from music city.