Summer ferry from Bari to Dubrovnik - again

[sallyhorton]

I see someone asked a similar question, but no-one answered. I'm going to Dubrovnik Sept 6th-ish next year. I know the schedules are far from published, but I want to book an apartment and need to know what nights the Bari ferry usually runs.... what would be a safe day to book my apartment? OR is there a better/another way to get to Dubrovnik from Italy (Pisa direction) without a car?