Please note that Naples is a highly requested touristic destination with many attractions and chances to enjoy the beautiful surroundings and the artistic and archaeological heritage of this multicultural context.
Thus, we suggest that you book ASAP!
We provide below a summary of the accommodations close to the conference venue (at a maximum walking distance of 5 minutes with a lovely walk on the waterfront).
When booking please consider allowing some additional days to fully enjoy your visit. Have a look to this site to get an idea of what expects you here!
https://www.visitnaples.eu/en

• Hotel Vesuvio(5*L) https://www.vesuvio.it

• Hotel Royal Continental(4*) https://www.royalgroup.it/royalcontinental

• Hotel Excelsior(4*) https://www.eurostarshotels.it/eurostars-hotel-excelsior.html

• Grand Hotel Santa Lucia(4*) https://www.santalucia.it

• Hotel Rex(4*) https://www.hotel-rex.it

• Hotel Miramare(4*) https://www.hotelmiramare.com/it/

The area is also full of Bed and Breakfasts and AirBnB apartments that are very nice and conveniently located at walking distance from the Congress Centre.
Have a look at the offer that they advertise (for instance on Booking.com).
In your search, you can consider as a reference point the address of the conference venue - via Partenope 36