Game of Shrooms is a once-a-year, worldwide art-N-seek event created by Attaboy. The next Game of Shrooms happens on June 10th, 2023. On that day, artists from all over the world hide their original mushroom-themed artworks in public places. Then, they give hints (often on social media) for others to find AND KEEP!
There appear to be several hidden in Ireland.
For more information, visit their website – https://yumfactory.com/gameofshrooms/