McGregor rents out the Funderland amusement park in Dublin, Ireland for a private event for friends and family, including his son, girlfriend and training partner, Ciaran Maher.

Great to meet this little man tonight. My training partner Ciaran Maher, his son and his wife. Ciaran's son was a patient in the cardiac department in Our Ladies hospital before. I went in one day on the low a while back and visited all the patients and helped out in my way for the department, and nobody knew about it, I made sure of it, but Ciaran reached out to me out of nowhere thanking me for it and I was like how do you know about that and was blown away as he told me of his son and his journey and that his life was saved by the people in the cardiac department in Our ladies. I done this on the low and it reached right back close to me out of nowhere. Crazy. It's crazy how you just never know. I invited the little champion, my brother Ciaran and his wife today and it was great to meet the little man, thank you for coming.

A post shared by Conor McGregor Official (@thenotoriousmma) on Jan 8, 2018 at 5:11pm PST