Numerous options are available via the usual booking websites. (There are several options on airbnb and booking.com.) Two options that are especially popular with conference attendees are listed below.
In town (walking distance from convent):
Albergo Il Castello http://www.il-castello.net
Nearby
Masseria Sgadari (18 min. by car from convent) http://www.masseriasgadari.com
The Masseria Sgadari (masseria means farm in the local dialect) is a luxurious accommodation, whereas those available in town are merely nice. The trade-off is the 18 minutes car commute. The location is remote without any restaurants or stores nearby and so is only recommended for those who are planning to rent/bring their own transportation. The owner has agreed to a special reduction of 10% on the quoted prices. To obtain the reduction, request it (mention the workshop and Nicola Persico’s name) when making the reservation. To reserve, write directly to the owner, Etta Sgadari, at avv.sgadari.etta@alice.it
Reaching the Masseria Sgadari can be tricky, especially the first time. Its coordinates (from Google) are 37.753872, 14.129092 . Here are the directions from the convent from Google Maps. Click on the photo icons that enrich the verbal description, they are helpful. There are also driving directions on the Masseria’s website, click here.
The Masseria may start filling up early; if you are set on it, it may be a good idea to reserve soon.
Another masseria, a little further away from the conference location is the Antico Feudo San Giorgio, linked below.
https://feudosangiorgio.it/en/
Other Possibilities
http://www.petraliavisit.it/category/dove-dormire/