The logistical details are that Walter Koenig will be the best man and Nichelle Nichols will be the matron of honor, but I particularly liked this part of the story:
Takei hopes the ceremony will be more romantic than his proposal.
He explains, "We knew that the Supreme Court was going to be coming down with their ruling. (We'd heard) that it was probably going to be positive. So I was planning on asking Brad to get married.
"We were at home in the kitchen and we had the TV going, and when the word came down suddenly Brad got on his knees in front of me. And I said, 'What are you doing?' He said, 'George, will you marry me?' I said 'Yes. You beat me to it. I meant to ask you.'"