The ornamental design for a stadiumseatattachment, as shown and described.
FIG. 1 is a top perspective view of one embodiment of a stadium seat stabilizer showing my new design.
FIG. 2 is a bottom perspective view of the embodiment of the stadium seat stabilizer shown in FIG. 1.
FIG. 3 is a top plan view of the embodiment of the stadium seat stabilizer shown in FIG. 1.
FIG. 4 is a side elevation view of the embodiment of the stadium seat stabilizer as seen from the right side of FIG. 3, the opposed view being the mirror image thereof.
FIG. 5 is a bottom plan view of the embodiment of the stadium seat stabilizer shown in FIG. 1.
FIG. 6 is a front elevation view of the embodiment of the stadium seat stabilizer shown in FIG. 1; and,
FIG. 7 is a rear elevation view of the embodiment of the stadium seat stabilizer shown in FIG. 1.