The more people you invite to attend your event in person the better.
There's something great about being part of a group of like-minded people who are experiencing something special.
I remember when I was a teenager, a very long time ago, and I went to my first Star Trek convention in New York City. I was a huge Star Trek fan and this was after the original series was cancelled and long before the The Next Generation series started, or the first movie. In fact, this was only the 2nd Star Trek convention ever.
Anyway, at the convention they played some of the TV episodes on a large screen. A movie screen. It was in front of a large audience of a few hundred people. During the showings I could here cheering and boos and applause and people yelling things. Up to that point I had only seen Star Trek at home. And only with 1 or 2 brothers and/or maybe my father. Many times I watched reruns alone.
The experience of sharing what felt like a very personal memory with hundreds of people, many of whom were acting out, was amazing. It was like I had just joined a lost tribe of several hundred family members at a giant reunion party!
So, my point is that the larger the group of people you can gather together to honor your guest and share in the emotions elicited from reading the tributes, the better. This experience will be something they will always remember and have in common.