The Business Posts' Ali Rochford said:

April sees three Irish Specialist Nursery Association (ISNA) plant fairs in interesting locations that provide a great day out for the family, followed by spring and early summer garden fairs and festivals all around the island. So add these dates to your diary now.

April 1 and 2: ISNA Plant Fair, Farmleigh Estate, Phoenix Park, Dublin 15.

Easter is traditionally a very busy gardening weekend.  This fair on Easter Sunday and Monday will be held in conjunction with the farmers’ market and runs from 10am to 5pm.  Admission is free.

April 8: ISNA Claregalway Spring Fair, Claregalway Castle, Co. Galway.
The fair takes place in the grounds of the restored 15th century Anglo-Norman tower house on the banks of the river Clare, 10km from Galway;

April 15: ISNA Plant Fair, Airfield Estate, Dundrum, Dublin 14.
Featuring the best of Ireland's independent nurseries the fair will give gardeners a chance to source the rare, the unusual, the new and best garden plants;          
                                                     The Business Post 18/03/2018