Hey,
I remember aoe2calendar being a reliable source for dates regarding tournament- and showmatches. I visited the website lately and it doesn't seem to be updated since April 2020. Via siegeengineers discord I was getting to know that there is a spreadsheet running in the background that fills the page.
With adoption to Liquipedia in the last months I think it could be reasonable to change that and use the Liquipedia API to pull calendar data:
https://liquipedia.net/ageofempires/api.php
Maybe it could be reasonable to get data from AoEzone as well. As I understand that the spreadsheet means more manual work for everyone that might be doing really much stuff in the background already.
But I really like the UI of aoe2calendar, because it's less cluttered than aoezone and liquipedia. What's your opinion on that?