The ornamental design for a partyplate, as shown and described,.
FIG. 1 is a perspective view of a party plate showing our new design, with
plate holders provided thereby shown in their normal operating condition
bent away from a body of the party plate; and,
FIG. 2 is a top plan view of the party plate showing our new design, with
the plate holders cut-out but co-planar with the body of the party plate,
the bottom plan view being identical.