Just a minor correction, "Stir-up Sunday" is not necessarily the 25th Sunday in Trinity. It is the Sunday next before (immediately preceeding) Advent. Due to the vagaries of the dating of Easter (The first Sunday after the full moon following the vernal equinox) Trinity is a season of varying length (to take up the slack in the calendar).
Stir-Up Sunday this year will be 24th November, so you still have time to gather the ingredients and a pudding bowl

Nigel