There are a few packages that define things like this, which can be added to the agenda view. You can see as examples the ones I use for national holidays in my config here: https://github.com/zzamboni/dot-doom/blob/master/doom.org#tasks-and-agenda

On Fri, 16 Apr 2021 at 04:21, Rodrigo Morales <moralesrodrigo1100@gmail.com> wrote:

Hello everyone,

Do any of you know whether there is a repository that contain Org files
whose main purpose is to list important dates of a given context
(specific countries, areas such as technology, biology, mathematics,
computer science, etc.)?

I'm asking this because I would like to have important dates of my
country in the Org Agenda, so before creating that file on my own I
wanted to know whether there are repositories that have already done
that.

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alias: rdrg109