Hacktoberfest is the month-long event held in October, to celebrate open source software. For the past seven years DigitalOcean along with its partners (including DEV) has run the campaign to promote opensource. The first 70,000 participants to complete the challenge will receive a bunch of free SWAG, including a limited edition Hacktoberfest t-shirt as a reward.
(You will also receive a Hacktoberfest badge for your DEV profile when you complete the challenge.)
This year you will have the option to choose either a Hacktoberfest shirt, OR the option to donate a tree.
To complete the challenge and win a t-shirt, you must sign up on the Hacktoberfest site and make at least four pull requests on GitHub by October 31st. Pull requests do not have to be merged and accepted to be eligible but if they are reported by maintainers as spam then it will be marked as invalid and won’t count.
Hacktoberfest is not just about free stickers and t-shirt. It a celebration of opensource. It's about giving back to the community and supporting it. This is also the perfect time for the new contributors to start their journey into opensource.
Contributing to open source for the first time can be scary and a little overwhelming. If you are a complete beginner to open source, Hacktoberfest is the perfect time to get started because there is a large community of developers ready to help you. (and there are a plenty of other beginners too). You can take a look at the Introduction to Open Source tutorial series to get started.
There are Hacktoberfest events happening all around the world. You can search and attend events near you from this page
There are tons of project available on GitHub for Hactoberfest. You can search for GitHub issues labeled with hacktoberfest or good-first-issue to get started. You can also use firsttimersonly.com and up-for-grabs.net to find issues specifically for new contributors.
Happy Coding !!