According to People, Billy Crystal hosted the ceremony, and Stevie Wonder performed. Whoopi Goldberg, Bobcat Goldthwait, and Bonnie Hunt were guest speakers at the celebration.
Williams’ widow, Susan Schneider Williams, and his children Zak, 31, Zelda, 25, and Cody, 22, also spoke, along with the Oscar winner’s longtime assistant, Rebecca Erwin Spencer.
Others in attendance included, Pam Dawber, George Lucas, Penny Marshall, Bette Midler, Jeff Bridges, Ben Stiller and Sarah Michelle Gellar.
A source told the magazine, "The ceremony was such a beautiful tribute and celebration of Robin's life. There was so much joy as well as tears. He touched so many, many people's lives and brought so much happiness and light."
One of the most touching moments came when Susan recounted the day she met Robin.
A family friend said, "One of the most moving parts was when Susan recounted the day they met at the Apple store. They smiled at each other from across the room, which turned into a conversation and them becoming best friends from that moment on."
The program helped honor Robin’s spirit with the Ralph Waldo Emerson poem, “To Laugh Often and Much.” Read it here.