Sommer Mathis contributed to these picks FRIDAY: >> DCist likes to stay up late on Sundays and watch Russell Simmons Presents Def Poetry”. We enjoy the variety of viewpoints it always includes, and really truly, at least one poet each episode knocks our socks right off our collective feet. DCist also likes to stay up late and watch “The Cosby Show” on Nick at Nite. It makes us feel all warm and fuzzy, like we…