app/views/events/_subscription.html.erb
<div id="subscribe" class="modal modal-fixed-footer">
<div class="modal-content">
<h4>Subscribe</h4>
<input type="hidden" name="subscription_user_id" value="<%= current_user.id %>" id="subscription_user_id">
<p class="subcheckbox">
<input type="checkbox" class="filled-in" name="sub_event_id" value="<%= @event.id %>" id="filled-in-event" checked="checked"/>
<label for="filled-in-event">Subscribe to Event</label>
</p>
<p class="subcheckbox">
<input type="checkbox" class="filled-in" name="sub_man_id" value="<%= @event.manager_profile.id %>" id="filled-in-manager" checked="checked"/>
<label for="filled-in-manager">Subscribe to Event Manager</label>
</p>
</div>
<div class="modal-footer">
<button type="button" name="button" id="btn_subscribe" class="btn">Subscribe</button>
</div>
</div>