Nicholas Caporusso points out to me a good opportunity promoted by Fiera del Levante along with Bollenti Spiriti [italian] and The Hub Bari [italian], with the support of Qiris [italian].
If your startup is founded by youngs and is less than five years old, you can book a free mini stand for (at least) a whole day to showcase your business. In addition, you can propose a demonstration, a workshop or a discussion on a specific theme.
All information is available in this pdf file. The deadline to nominate your startup is September 3.