I am interested in landing in München (Munich) on 1st of May, and then taking the bus to Ingolstadt. Does the bus operate on 1 May (since I am only interested in Airport-ZOB Ingolstadt)? This is a public holiday (Maypole Day) in Bavaria.

I guess it will be sparser, but that's OK. I don't want to book a flight and then find out that there is no bus! I pretended booking a ticket for the bus, but the system says its far too early, so doesn't really answer the question.