Ciao a tutti!

I'm planning a trip to Tuscany next September with my girlfriend. I wanted to get tickets for a theatre show (play, opera, musical, concert...whatever!) but it seems that it's an impossible mission.

I know the cities I want to take her (Pisa, Lucca, Pistoya, Firenze, Arezzo, Asciano, Siena and San Gimignano) but I DO NOT have the route planned yet (so I don't know which day we will be in which city). So I tried to look for ANY show, in ANY city, in ANY day that we are going to be in Tuscany. And I found NOTHING! I have looked up the official websites of the main theaters in every city, and their program only covers until July.
For example:
Teatro Petrarca (Arezzo) - - Last show on March 2019
Teatro Verdi (Firenze) - - Jumps from June to October
Teatro di Pisa (Pisa) - - Last show on July, 6th
Teatro del Giglio (Lucca) - - Last show on May 2019

I assume I can't find it because maybe it's too early (so I have to wait a little bit) but I am used to Spain (I'm Spanish) where you can check what show they'll have in the next 7 or 8 months.

Can anyone help me with this? Is there a webpage where I can find it or I should wait?

P.S.:My original plan was to get tickets for an Opera in Arezzo, just like the movie La vita รจ Bella where Guido takes his, at that time, future wife, to the theatre.