Jason Momoa heads to Hawaii to help find a bone marrow match for a young boy and his longtime friend

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While many celebrities were out partying over Halloween weekend in Los Angeles, Jason Momoa went back home to Hawaii for a very good cause.The 43-year-old actor appeared at an event at Brigham Young University - Hawaii on Friday, to promote people registering for the bone marrow registry.He did this on behalf of his longtime friend Travis Snyder, who suffers from leukemia, and a six-year-old boy named Rhyder Lopez, who was born with the ultra rare genetic disease Hemophagocytic lymphohistiocytosis (HLH).

Good cause: While many celebrities were out partying over Halloween weekend in Los Angeles, Jason Momoa went back home to Hawaii for a very good cause Rhyder: He did this on behalf of his longtime friend Travis Snyder, who suffers from leukemia, and a six-year-old boy named Rhyder Lopez (left), who was born with the ultra rare genetic disease Hemophagocytic lymphohistiocytosis (HLH)Momoa took to his Instagram over the weekend to share videos from the event and to get his 17.2 million followers to get involved with his Be The Match campaign.Momoa sent the first video on Friday, which showed the massive actor rolling up to campus on a motorcycle to cheering fans, while he met young Rhyder Lopez.