The 2020 Cycling Ireland events calendar is released online.
See below links to the different calendars.
Road Events
http://www.cyclingireland.ie/page/events/events-calendar/road-events
Leisure Events
http://www.cyclingireland.ie/page/events/events-calendar/leisure-sportive-events
BMX, Off Road and Track events
http://www.cyclingireland.ie/page/events/events-calendar/bmx-off-road-and-track