Free State Brewery, 636 Mass., is celebrating its 20th anniversary this week, in part by donating the proceeds of today’s sales to the Social Service League of Lawrence. The league, the oldest service organization in Lawrence, operates a thrift store at 905 R.I.

The brewery also is offering discounts: on beers Thursday, and on meals and desserts Sunday and Monday for people celebrating a birthday that is the same as Free State’s, Feb. 23.