Hackathons

Wikipedia - A hackathon (also known as a hack day, hackfest, datathon or codefest; a portmanteau of hacking and marathon) is an event where people engage in rapid and collaborative engineering over a relatively short period of time such as 24 or 48 hours.

Hackathon List - https://devpost.com/hackathons

Joshua Tauberer Hackathon How To Guide - https://hackathon.guide/

Hacker Events = https://www.bemyapp.com/events/

Facebook Hackathon Groups = https://www.facebook.com/vhack.usm