SELECT t1.party_email FROM parties AS t1 JOIN party_forms AS t2 ON t1.party_id  =  t2.party_id WHERE t2.form_id  =  (SELECT form_id FROM party_forms GROUP BY form_id ORDER BY count(*) DESC LIMIT 1)
Find the emails of parties with the most popular party form.
SELECT t1.party_email FROM parties AS t1 JOIN party_forms AS t2 ON t1.party_id = t2.party_id WHERE t2.form_id = ( SELECT form_id FROM party_forms GROUP BY form_id ORDER BY count ( * ) DESC LIMIT 1 )
select t1 . party_email from parties as t1 join party_forms as t2 on t1 . party_id = t2 . party_id where t2 . form_id = ( select form_id from party_forms group by form_id order by count ( * ) desc limit value )
Find the emails of parties with the most popular party form .