Doors opened at 11am today with lots of activities including horse-riding, train rides, climbing wall, Fosset's Circus and more.
Barretstown celebrates it's 30th anniversary today with a family picnic at it's estate.
The charity hopes to help over 22 thousand children suffering from cancer and serious illnesses in hospitals and schools throughout the county and country this year and has served 120,000 children.
The big picnic fundraising event is welcoming families to the event.
Dee Ahearn CEO of Barretstown says there's something for everyone. Some of the activities include horse-riding, mini-golf, Fosset's circus, climbing wall, train rides, live music, food stalls and a teddy bear clinic.

Council Says Sarto Road Site Has No "Significant Contamination” As Build Advances On Locals’ Green Space
Nine Arrested In North Kildare Retail Crime Crackdown
Wheelchair-Bound Woman From Suncroft Left "Distressed" After Pack Of Hunting Dogs Burst Into Garden
Hundreds Of Kildare Households Got Average €228 In Storm Aid After Éowyn
Government Poised To Approve Statutory Public Inquiry Into Children’s Spinal Care
Saint Vincent De Paul Says Need For Help “Soaring” As Families Struggle To Afford Christmas
Kildare District Heating Studies Underway As Ireland Plans Major National Rollout
Government To Replace Apartment Planning Guidelines After Challenge Involving Clane-Maynooth Cllr