If you have already book everything , why not coming to the island ?
i don’t know where you are from but the weather in northern Europe is just the worst for years !
in September ( it’s always more laid -back about everything anyway ..) you will listen to good music in small places … enjoy the beaches , try new restaurants ect … not a bad thing to do if you already book everything! Or you go to a good festival in Europe as many will happen in September!
Don’t think the club will open this years tbh and if they open , it will be just one or two of them end of september or even later . Next summer will hopefully see the real clubbing back to ibiza