Note that Monthly and Weekly challenges run in October, too.
"OC" standing for "Original Character" here. This is a drawing challenge running annually throughout September
What's the challenge? Draw your OCs, ideally one image per day.
Where, how to take part: Post anywhere using the tag "oc-tober".
This is an annual drawing challenge running from October 1st to 31st.
What's the challenge? Draw gore, ideally each day
Where, how to take part: Post anywhere using the tag “goretober”
This is an annual art challenge, running from October 1st to 31st
What's the challenge? Draw owls, ideally one per day.
Where, how to take part: Post anywhere, using the tag “owltober”.
This is a creative challenge repeating annualls on the first weekend of October
What's the challenge? Create a 24 pages comic in 24 hours.
Where, how to take part:
This is a creative challenge running annually from October 1st to 31st
What's the challenge? Draw Halloween-themed images, ideally one per day
Where and how to take part: Post anywhere, using the tag “drawloween”.