Use the MF access trail, about a 6-min. walk from the Uberfall, or a 2-min. walk from where the East Trapps Connector Trail meets the carriage road. The trail deposits you at the base of MF; Mother's Day Party is the route immediately to the left. The route starts at the base of a small left-facing corner that arches towards the left.
P1: Climb straight up the corner and continue to a ledge. The first crux is getting through the small right-facing flakes to the base of the greenish corner. Step left, up the orange-colored face for a few moves, then step back right to the corner at a small overhang. Fire through three big moves on good holds (2nd crux) to the MF bolt anchors. 5.10b, 80'.
P2: Diagonal up and right to a notch in the roof. Pull the roof (crux) to join MF, and follow it to the GT Ledge. 5.10a, 90'.
I think the description describes a variation that angles right out of the curving left facing corner to reach the MF bolt anchors. That's the sensible way to TR it from the MF anchors, but I believe the original route continued up and left in the arching corner past another crux move involving (for me) a one finger jam to reach the gigantic hand traverse flake.