Using blog as agenda

I need some help here: I intend to use the regular blog item within a Quark heritage as an agenda. Thing is, there are agenda items to come, and agenda items in the past. My question is how I can possibly modify the order of these items. To explain, let's image monthly agenda events. The agenda/blog page looks like this:

February 2020 : Making Sushi
March 2020 : Making Pizza
April 2020 : Making Pasta
"Too late" [(an undated agenda item)]
January 2020 : Making Salad
December 2019 : Making Rice
November 2019 : Making Bread

So essentially I have two item orders, one asc, one desc. And once an event is over, it needs to go down below the "Too Late".

Any ideas how this can be done ? I don't mind moving past items if that doesn't mean I have to touch all items.

Thanks !

@Andrass, You might want to have a look at the docs on Complex Collections and Collection Object Methods.

You could, for example, create 2 collections using the filter Collection::dateRange($startDate, $endDate, $field) and sort them differently.

Of course, in Grav there are more road leading to Rome...

@Andrass,

The Collection:order() function does not seem to provide for a nested 'by'...

Collection extends Iterator, which has a method sort(\callable $callback=null, bool $desc=false): \Grav\Common\$this/array.

The $callback function can then sort on any Page property you like. I guess...

Don't think you can use this in the page header, but maybe in Twig.

Thanks for looking into this, much appreciated!