Thank you for the help. I think I've got it. I was approaching it wrongly I think.
Now I have set up a week long event, recurrence every second week, and alarmed one minute before it happens.
Once for each child. That's what you were suggesting, I think?
That's going to work, I think.
The alarm is currently showing 'Blue Team Week' and I expect it will show the same thing tomorrow - probably with 'overdue 1 day' on it but I don't mind that. And continue like that for one week.
Then it will switch to 'Green Team Week', I think, I hope and everything will be fine.
If it is a bit messy and the alarm from Blue Team week is still showing I don't mind going to the trouble of 'dismissing' that.
That 'garbage can' thing I already have set up differs in that it is only a one-day event.
How can I vary the time to see how it functions? Not within Rainlendar I think? Have to change the system time if I want to do that?
Perhaps I'm not using Rainlendar as intended in that I rely almost totally on the 'Alarm' screen?
Looking at the events and tasks screens now I notice that the events screen shows me one week ahead - if it were capable of showing somewhat more than that it'd be performing the 'change the date to see what happens' function I mentioned.
It's a great little utility, that's for sure. Even though I only use it for at-home trivia like garbage collection and kid-pleasing. If I were at work with an office (I'm retired) I'd certainly lean heavily on it I think.