"Inktober" is a yearly drawing challenge to create an ink drawing everyday in October.  Created by Jake Parker in 2009 as a way to improve his inking skills, it has since grown into a worldwide endeavor with thousands of artists taking on the challenge every year.

I first started participating in 2014 and have seen an incredibly amount of growth each year.  I highly recommend any artist to try it.
Just remember to have fun and not to let the pressure get to you!