For several years — first in version 1 and then in version 2 — I have been trying to add “moveable feasts” to a timeline. Moveable feast being events such as Advent, Easter, Ramandan. Of these Advent with Stir-up Sunday is the most crucial because it links to the fixed date of December 25th. I want this timeline feature to aid my celebratory baking/patiserrie/cakes/etc for Christmas. I make my Christmas cake on Stir-up Sunday, which is the Sunday immediately before the First Sunday of Advent. Yet make my lebcuchen dough is made on 25 October. Currently I put up with doing this in a spreadsheet, which includes a sheet to calculate the dates of Advent and Stir-up Sundays.
Having used Aeon Timeline versions 1 and 2 for fixed calendar events (typically plot lines for the great unpublished novels) I would like to try setting up these “moveable feasts” in version 3 so I do not have to update that dratted spreadsheet or a Timeline timeline. But v3 is defeating me.