I'm preparing a large dinner for an organisation at the moment and decided that we'd make the menu vegan/vegetarian (we use a wonderful Italian caterer, so flavour isn't going to be missed). When I mentioned it to some omnivore colleagues, they asked why and I shrugged and said "the Amazon is burning". They shrugged back and said, makes sense. It's not many years since I would have expected complaints at not catering…
I cook vegetarian Italian food myself often but honestly find that the cuisine is still very much meat based. Good luck finding a vegetarian main dish ("secondo") in Italy (outside of Milano).
Pasta con pesto/pomodoro/grilled veges/spinach/cheeses..
Aubergine Parmigiana
Pizza/Calzone..
Minestrone/Zuppa de../Ciammotta
I mean, that's without even looking at a cookbook.
I find Italy itself (particularly more southern) far more accommodating to my diet than Italian restaurants outside of Italy.