fields = (
           (None, {
               'fields': ('title', 'short_abstract', 'cat', 'audience', 'status')
           }),
           ('Extra Information', {
               'classes': 'collapse',
               'fields' : ('long_abstract', 'slides')
           }),
           ('User Profile', {
               'classes': 'collapse',
               'fields' : ('foreign_key__userprofile')
           }),

        )