I gave my “Midburn – creating an open source community” talk in Hacktoberfest 2017 @ Tel Aviv. This is the local version of an initiative by DigitalOcean and GitHub.
I was surprised about the vibe both the location and the organizers gave the event, and the fact they could easily arrange t-shirts, pizzas and beer.
Looking at the github search, it seem the worldwide event brings many new contributions. I think we have something to learn how to do a mass concept like that. Especially when it crosses both project limits and country limits. (e.g. not a local bug squashing party).