score:5
I traded Facebook messages (in Italian) with Galleria Borbonica: they have not yet decided whether to be opon on the 19th of September, the Festival of San Gennaro. This year it falls on a Tuesday, and might open only the Bolla for viewing the aquaduct bridges. The decision will be taken at the end of August, with a 70 percent chance of being open on the 19th.
Salve..non abbiamo ancora deciso..sarebbe un festivo locale..poiché è martedi potremmo decidere di essere aperti x il ponte però decideremo a fine agosto..probabilità di apertura 70 x cento!!!
They are VERY responsive, within an hour, so you might FB message to check just before your trip, or when you're already in Italy.