Since I am based in the Netherlands I basically only know of Dutch (and some Belgium) shows, so I will start with making the calendar for these countries. But if anyone knows about any other shows in other countries please just leave a reaction I will edit the OP.
28/01/2023 pokemonbeurs Venray https://www.pokemon-beurs.nl/
29/01/2023 Pokedayz Maarssen https://www.pokedayz.nl/
18/03/2023 and 19/03/2023 pokemon VGC special event Jaarbeurs Utrecht
26/03/2023 Pokedayz Maarssen
23/04/2023 Collect A Con Nijkerk (not just pokemon) https://www.collectacon.nl/nijkerk2023/
28/05/2023 Pokedayz Maarssen
30/07/2023 Pokedayz Maarssen
1/10/2023 Pokedayz Maarssen
26/11/2023 Pokedayz Maarssen
05/04/2023 Pokedayz Sint Niklaas
25/02/2023 Cardshow Suisse Solothurn
Whenever new pokemon days are scheduled I will update the thread I think:) Any help with other countries is also greatly appreciated!