There is a public group on Facebook called #30x30DirectWatercolor2018. They are challenging participants to paint 30 quick & loose paintings in 30 days during the month of June. From what I have seen in the lead-up to this challenge, some participants are quite experienced; others are rank beginners. There's no pressure, other than to encourage people to paint quick & loose--NO pencil sketches beforehand. All the drawing is to be done in paint.
Just thought I'd mention this in case anyone might be interested.