I joined a "Meet-Up" group of plein air painters on the last Sunday of January in Sonoma County and had a great experience. The group loosely convened about 1 p.m.and wandered off in many directions. We gathered back together late in the afternoon and showed each other what we had accomplished.
Here's a photo of my finished painting "Marsh and Mountain" on the easel. You can see my pencil sketch up in the corner.
It's now ten days later, the paint is dry, the painting is framed and ready to be shown to prospective collectors at an event this weekend.