The guys at the creators collective podcast have a on going photo challenge. every fortnight they chose a different subject for the challenge. where you have to take a photo on the chosen subject, like texture, contrast, the rule of thirds.
On instagram the art of geeks have a different theme every month for their challenges, examples are jurassic Park, super Mario brothers, avengers. Its as simple as make something based on the theam of the month for bragging rights. You can find art of geek challenge on instagram here
AS Wood Turns is hosting a lathe sphere challenge. Get involved by turn a project involving a sphere in some way either as a component or as a finish project. Anything goes. click here for full details. and also check out Alan's video about the challenge here
also follow Alan on Instagram @as_wood_turns
Giaco Whatever and Karoline from Prop Shop Berlin has announced a challenge on Instagram to make somthing with a skull and be in a chance to win one of his maker knifes. check out his Instagram post for details click here
and to see the kick starter for Giaco's maker knife click here
The inventables power hour challenge see what you can carve in a hour and maybe win a X-carve (no x-carve needed just use the free easel software) see link for full details https://www.inventables.com/projects/easel-power-hour-challenge?
Rockler and modern maker podcast are doing a plywood challenge. see what you can make with a single sheet of plywood
for full details check out https://www.modernmakerpodcast.com/plywood-challenge/
this was my entry Fold down desk