Both. I try to sew every evening after I put the children to bed. That's alone, me, my machine and Leroy Jethro Gibbs (I'm watching NCIS seasons in order on DVD!).
I recently joined a Guild but we don't sew at once a month meetings.
One highlight is my "Sew Scrappy Sisters" group - there are 7 of us - some scrapbook and some sew. We rent a church hall one Saturday a month from 8:30am until 11:00pm and we do WHATEVER we feel like doing. I work in a VERY male dominated environment and the time with other women is highly valued. We eat dinner together (typically takeout) and have show and tell time at some point during the day / night. We've also gone on 3 / 4 day retreats for intese productivity; serious cocktails and laughter as well!