Does anyone know how to spawn in events via the sandbox cheat menu? I tried things like
"badsun" and "piramid" but those say "illegal action" in  a popup.

download unreal engine unlocker, find some ytbers that use it and pray they got cmds in the desc of the vid

heres the command for the physgun. summon prop_physgun_c

bonus: orangekerfur boss command: summon murderkerfur_c