Want to add individual checkbox fields to Ruby on Rails/Devise form

I'm trying to present users with a series of checkboxes when they register (and also when they press their my account button) that signs them up for certain events.

ex.

First name Last Name Profile name password repeat password

Do you want to attend these events? [ ]Event 1 [X] Event 2 [ ] Event 3

A user isn't required to click on any of them to sign up for an account, but we want to have a simple way for them to be aware of their choices and modify them at any point.

I created a boolean field for each of the events (about two dozen in total), but when I try to sign up, none of the new checkboxes appear. When I try to sign up for a new account, I get this error:

NoMethodError in Registrations#edit Showing /home/ubuntu/workspace/app/views/devise/registrations/edit.html.erb where line #33 raised:

undefined method `nov11underlinecommute' for #<User:0x000000038aa518> Extracted source (around line #33):

<div class="field">
       <h2>Which WHEELS 2015 events are you planning on attending?</h2>
       <h3>Wednesday, November 11th</h3>
     <div><%= f.check_box :nov11underlinecommute, {}, true %> <%= f.label :nov11underlinecommute, "6:30 am -- Underline Commute" %> </div>
     <div><%= f.check_box :fiuride, {}, true %> <%= f.label :fiuride, "5:30 pm -- The 99% Ride from FIU MM Campus to Brickell" %> </div>
   <div><%= f.check_box :brickellbikein, {}, true %> <%= f.label :brickellbikein, "7:00 pm -- Brickell Bike-In Block Party" %> </div>

I already added all of these fields to my db/migrate/add_users file, ran rake db:migrate, and edited my registration controller as well as edit.html.erb to apply all of these fields. I'm not sure how to add it to new registrations (once it works), however.

Github repo: https://github.com/yamilethmedina/wheels_registration.git

Development version (rails server currently running): https://wheels-registration-yamilethmedina.c9.io/

There's probably a better way to do this...if so, can you point me to where I can find out? Thanks!