This year Pesach Sheni is on Erev Shabbos. There are different traditions as to when to eat matza on that day every year. Some do so on the afternoon of the 14 of Iyar, which was the time when the Korban Pesach Sheni (second) was sacrificed. Others eat the matza at night. If my Minhag is to make a seuda in the day, can I this year since it is Erev Shabbos, eat the matza at the Friday night Shabbos Seuda? Do I have to be Matir Neder (absolve a promise)?

The best way is to eat the Seuda on the early Friday afternoon, when usually people eat lunch, after Chatzos or midday when the Korban Pesach was done and also following your tradition.