I attended.
Quite a few people showed up. I left during the 4PM brake (event was schedule to start at 2), and it continued well after I left.
We had a lot of speakers. Several were very good. Others had their own approach, which may or may not have impressed but showed some diversity of thought.
They had fewer speakers. They came wearing a uniform: an orange "never again" T shirt with an AR15 crossed out on the front and anti gun stats on the back. They were mostly middle aged females, thin, many blond, mostly giving a typical upper middle class/educated vibe. A few older males, some children as well.
Their side had several children speak. One very nervious teen girl read a Thomas Jefferson quote that called for social change (no idea if it was a legit quote). One of their better speakers attempted to separate the gunshow from the wider gun control issue, but that was a dubious effort since other speakers made it clear they were opposed to "gun culture" and that gun control was their plan, as well as the message on their t shirts.
Also, several of their speakers who were not wearing the t shirt were teachers and good speakers. Their strident anti nature and clear leftist ideology undercut their message IMO, but they were good at delivery and sharp.
One of their speakers made the argument in terms of risk and liability. She was probably the most effective. The state board that controls the fairgrounds appears to have a number of lefty members who no doubt would like to close the show. They likely were looking for any good arguments to support what they want.