Great Events For Beginners
If you're just starting down your path of learning to code, or looking to brush up your skills, here are a few meetup groups around Tokyo which provide a helpful atmosphere.
I Teach You Programming, So You Teach Me English!
A relaxed weekly event with many helpful members. Work on your own project, and freely ask for help.
A large monthly meetup with plenty of helpful people of varying skill sets. There's an introduction section where you can announce what you're working on or trying to learn.