R. Chaim Berlin on Eating a Purim Meal on Shabbat (5 Adar Sheni)

שו"ת נשמת חיים ע"ז 5 Adar Sheni 5654 (1894)

​R. Chaim Berlin wants to know why we delay the Purim meal when it falls on Shabbat, but do allow weddings when Purim is on a weekday. Can we have other events coincide with Purim or not?