[Fixed]-Django + ManyToMany field + Parsing JSON from fullcalendar (saves empty)

You seem to be skipping the case where form.is_valid() returns false–are you sure the form you’re posting is valid? Perhaps add an else and check for errors or re-display the form template (which automatically shows errors). The typical format to follow is here: https://docs.djangoproject.com/en/1.8/topics/forms/#the-view

Also, I’m not sure you want to use tour = models.Manager(). Perhaps a ForeignKey would be more appropriate. Not sure if this is the problem with the form, since you seem to have cropped some of the view code.