Can you tell that it is safe to go bali from 13 aug to 21 aug 2018
It’s no harm ???
I am travelling there on exactly the same dates. Can it be guaranteed that Bali will be safe? No but tourists who are there now are reporting that there are no issues affecting their holidays. You need to weigh how comfortable you are to take your holiday there and be prepared if there are any emergencies.
It is probably very safe as long as there aren't any more major earthquakes either at or near Bali. Of course earthquakes are completely unpredictable so only you can decide whether to go or not. Earthquakes occur without giving any prior notice, they just happen.