The AFL finals series runs through most of September, culminating in the Grand Final at the very end of the month or the start of October. 20 September 2029 falls inside this finals fixture list, alongside the NRL finals running on a similar schedule, with both codes crowning premiers within weeks of each other.
Workplaces commonly schedule their heaviest meeting load on Thursday, leaving Friday clearer for closing out the week's remaining work. 20 September 2029 falls on this day, the fourth working day of its standard Monday-to-Friday week, with one working day remaining before the weekend begins and the count above resets for Monday.
A public holiday that falls on a Monday or a Friday produces a three-day weekend without using any annual leave, which is why long-weekend planning around 20 September 2029 depends on which day of the week the nearest public holiday falls on. A midweek holiday delivers no such automatic extension, though many workers bridge it with a single day of leave.