Don't know where to start? Here's a few ideas based on your skill level or interest

I haven't been involved in a hackathon before, but if you like this pitch here's, how you can help out no matter what your experience. The only success criteria is to Make it Better

Just started with Mojolicious - Beginner

Go to Getting Started and try the tutorial.

flag the steps that you don't understand
find the code that doesn't work
Tell Me - file an issue, reply to this issue, email, throw soft toys
if you're feeling brave, try and correct the mistakes (clone the repository, fix the mistakes, upload and send a pull request)

Mojolicious intermediate

Find the parts of the tutorial that are confusing and improve them.
Add links to appropriate guides on web programming and security.
Write a step on how to use MojoX::Session
Improve the test suite
Switch code to use credentials stored in config files
Suggest new or missing Steps - what does a Secure Application need to do?

Mojolicious expert

Extend MojoX::Auth::Simple to handle LDAP
Show me how to add OAuth2 to the tutorial
Suggest completion criteria - when is the tutorial ready for production use?

Security expert

advise on best practices for session tokens, authentication, DOS prevention and web programming

potential Mojolicious book authors - stretch goal

Writing a book is a huge undertaking but a great resource and I've seen at least one started a few years ago. If we broke down the task and distributed it out, it might finally get finished even if it only ever lives online like the Perl Data Language book.

write a tutorial for any of Joel's suggested topics that doesn't have examples in the docs
- point to docs for topics that are now well covered
suggest a logical order for topics and organize chapters
update topic list for Mojo7

Alternatively, I've enjoyed one book (Bad Data, O'Reilly) that took the form of 17 authors contributing a chapter each, themed on a real-life problem, its solution and all the obstacles encountered along the way.

I'll stop here for now.

duffee / Mojolicious_session_example