My friend in Battle Creek has some friends that pitched a nice large tent in their back yard a few summers ago and lived in that for the summer... He calls them "The Rabble-Rousers"...
They made it real nice with some carpet, couch, love seat, coffee table, end table. and ran extension cord from the house for a couple of lamps and fans.. They used lap tops for movies & surfing the web...
It was pretty cozy... Like an out door living room...