A security team that can do this job is going to cost, unless you have local or federal protection. A friend of mine, who's a former Green Beret and Ranger, runs a protection agency that basically protects singers and movie stars on tour. You are talking about $ 2 to $ 5 million for an average 20-man team, and 20 men won't cover this vast area. Because most of those things are indoor
There are different levels of security teams, some comprising current or former police officers. You are talking about $10,000-$20,000 per event, and then there are dedicated, trained teams, usually offered by security solutions, which can cost up to $100k per event. The most expensive is a former SF or a former USSS/DSS guy, both have extensive personal protection experience, and those teams cost 7 digits.
Kirk is a mid-level YouTube streamer with a political connection; he won't be able to afford the A team on this. Probably, his team was provided by a trained team from Serco or Triple Canopy