The "official" or regular weekend of the Potomac River Convention is the first Sunday in April and the Saturday before, except when Easter falls on this weekend. Note that the weekend defined in this manner may not always equate with the "first full weekend in April."
According to a policy set by Potomac River Convention organizers over a decade ago, if the regular weekend (defined above) coincides with Easter weekend, the Convention will be held on another nearby weekend to be decided on a case by case basis. This is the case in 2018. The next years in which a conflict with Easter will occur are 2021 and 2026. In contrast, if the regular weekend falls on Palm Sunday, the Convention will take place as usual on its regular weekend. This will happen in 2020, 2023, and 2031. (We certainly assume that the Potomac River Convention will continue to be held during these years and ad infinitum.)
Recent experience has shown that when Palm Sunday falls on the same weekend as the Potomac River Convention, there is little or no reduction in Convention attendance, because most of the attendees are not committed church choir members. This was certainly the case in 2004, 2007, and 2012, when the convention turnout was excellent, particularly on Saturday all day and Sunday afternoon.