I have seen threads asking for recs on both these dishes and just wanted to mention:
Cassoulet: Rendezvous in Central Sq, Camb, is doing this every Sunday in April. It is a really really terrific version. we had it this past monday as part of their very generous and enticing Tapas Bar Mondays menu.
Soft shells: Strip Ts in Watertown has, on their current menu, the biggest most succulent whales
i have ever seen in a boston restnt. as big as a steak. red curry sauce. a dining highlight for us last week.