Foundler - Online hackathon weekends. Attend every other week.
CoFoundersLab - Meet 250,000+ entrepreneurs online
Ship That Shit - Join 3 no BS events to help you ship that shit
HackHub - Host tech events and hackathons with ease 👨💻🛠
FounderWheel - Meet potential co-founders everyday
Confs.tech - Open source list of tech conferences: JS / Ruby / Data etc.