Michael Garr was killed while walking home on the 200 block of Bridge Street back in April.
Police have yet to identify any suspects.
Michael's gathering was held on the block where he was stabbed to death.
"Celebrating through grief is very difficult, but today we will celebrate him. We will talk about our memories of him, maybe go fishing, have a catch, listen to music - do our very best to smile," said uncle Michael Peabody. "Happy birthday, Michael. We love and miss you."
The family is launching a non-profit to honor Michael's memory.
It will be used to help children achieve their goal of higher education in fields like sports broadcasting, which was Michael's life-long dream.