I'm not going to post the video here, because I don't know if it came from a Korean media site or an attendee, but there's a video circulating on twitter of YG giving a speech at his brother's wedding. I do know for a fact that there were Korean media sites that were present at the wedding and that photos were shared publicly with the family's permission. But the source of how the video was obtained is unknown.
In any case, there's of course the "we must protect YG and his family, it's not a public schedule, he didn't share it himself" blah blah blah all over twitter. I get so irritated with that fandom whenever anything gets leaked. They don't understand that repeatedly viewing it to demand it be deleted (and nothing is ever deleted from the internet, let's be real), is just going to give it more attention. Sometimes shutting up and not reacting in the best thing to do.