https://www.cnn.com/2023/05/29/us/ho...day/index.html
What we need is a portable metal detector. Built like the old phone booths, on wheels, with a bit more room. Take it to the park, to an event center, the beach, or local park.
You want to enter the party, you must be examined before enter the party area. You go in and the door shuts, and scan the subject. If it detects metal keep it locked shut until the LEOs arrive. It should Have a breathalyzer, for the idiot who shows up to the party drunk.