The International Wetlands Day falls on 2nd February every year. There is great information about International Wetlands Day on the Ramsar website at this link. Closer to the day (2nd February 2022), you should look at the info on www.irishwetlands.ie too, as that site usually has relevant information about events here in Ireland to mark the international wetlands day.
Unfortunately, International Wetlands Day usually happens at a time of the year when there is very little going-on in the Irish wetlands. This is because during January and February the wetlands in Ireland are ecologically dormant and many will be heavily inundated with water or may even be flooded at that time. Most emergent plants will have died- off during the previous autumn and early winter and many of the insects and invertebrates will also have died away and the larval stages will hiding out in the mud at the bottom of the wetlands. In fact, many Irish wetlands look very sad and are not really very interesting to look at in early February.
The best time to visit the wetlands in Ireland is from early May until early September.