To try it out, I created some example data in BootStrap.groovy,
so you can login with the email joebob@rapidcommittee.com and
password rapCom. You can also try some bad login info to see
a bootstrap alert message.
So I ended up getting a little creative and adding some domain classes for Meetings and Users as well as Committees. CommitteeMembership is the link between Users and Committees.
I ended up scaffolding a lot of the CRUD operations. I'm not sure if this is what you had in mind but if you want I can go back and create them.
You can find a few integration tests in test/integration/com/rapidcommittee/MeetingTests.groovy
and some unit tests in test/unit/com/rapidcommittee/UserTests.groovy.
I set up a small login for Users and added some Bootstrap styling to it. I decided not to spend too much time working with the HTML/CSS since I figured that you had already seen a little of what I can do with HTML/CSS/JS. (Actually, in the project I showed you I was using LESS but that's just fancy CSS3).
For the login, I did not implement any password hashing which of course isn't realistic, but adding a SHA/md5 codec and passing the password through it before insertion and during login wouldn't be too difficult.
For bonus points and convenience, I .gitignore-d class files.