Date validation

[harry-bridge]

Can create a showing of a show before the start date of the show

[wjdp]

Can enforce this with a field_clean method on a form, unsure how you'd do for admin, think you can override the form.

[harry-bridge]

@wjdp Obviously the correct option here is to make a nice custom admin interface

[wjdp]

Django admin is very capable and extendable, wouldn't go re-inventing the wheel too much!