from django.contrib import auth
from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth.models import User, Group
-from django.newforms import form_for_instance, form_for_model
+from django.newforms import form_for_instance, form_for_model, HiddenInput
from django.shortcuts import render_to_response, get_object_or_404
from django.template import RequestContext, Context, loader
from eventos.models import Palestrante, Trabalho