It’s October, and because I’m a German who hates Lederhosen, I feel like I need to compensate ;). Just kidding, have you heard of Hacktoberfest? It’s an awesome initiative that was started 5 years ago. A lot of companies are on board this year, including Microsoft. To learn more about Hacktoberfest, have a look at the the official website.
I’m definitely contributing something to one of the Microsoft Open Source repositories and likely elsewhere.
You should join Hacktoberfest. You might even get a free t-shirt!