147, on erev Pesach there is a still a chiyuv of Shalosh Seudos, we just have the 3rd meal earlier in the day before the zman of eating chametz. Many shuls will daven k’vasikin on that day in order to facilitate this
WADR, I do not believe this to be correct.
When Erev Pesach comes out on Shabbos, many shuls WILL daven extra earlier — but the reason is so that we can eat the *second* meal before the end of the chometz eating period.
Some people have the custom to wash/bentch twice at that meal so as to have a third meal with bread on Shabbos. However, that doesn’t *really* count, since you can’t begin the third Shabbos meal that early (and have it count as the “official” third Shabbos meal).
The Wolf