function HH(playerWhoClicked)
game.Lighting.RemoteEventCON:FireClient()
end
script.Parent.CON.MouseButton1Down:connect(HH)
function Aaactivate ()
bin.ConfettiC.ParticleEmitter.Enabled = true
end
game.Lighting.RemoteEventCON.OnServerEvent:connect(Aaactivate)

2 comments
You are firing to the client but still using on"Server"Event on the server side
Don't store remote events in Lighting... Use replicatedstorage...