Does anyone publish a list of May 1, 2018 holiday closures for Rome?
It is really best if you go to the website of sights and sites you are interested in and see what they say about May 1. Second to Christmas, it is a huge closure day but there are exceptions. Be aware, also, that bus service is virtually suspended for a few hours in the afternoon. It is Labor Day, after all. We had to walk home after lunch on May 1 more than once when we lived there! Services and restaurants in the tourist areas will be open.