Find the name of the most popular party form.
SELECT t1.form_name FROM forms AS t1 JOIN party_forms AS t2 ON t1.form_id  =  t2.form_id GROUP BY t2.form_id ORDER BY count(*) DESC LIMIT 1
SELECT t1.form_name FROM forms AS t1 JOIN party_forms AS t2 ON t1.form_id  =  t2.form_id GROUP BY t2.form_id ORDER BY count(*) DESC LIMIT 1
[{'form_name': 'Property Change'}]