In case anyone was wondering the Public Holiday on 7th June is to " commemorates events which occurred on that day in 1919, when following a series of riots by the Maltese population, British troops fired into the crowd, killing four." from: http://en.wikipedia.org/wiki/Sette_Giugno
So, us expat. Brits should probably keep a low profile!
However, my Maltese friends and work colleagues have told me that there will be some sparsely attended official functions and a bit on the local news, but that most Maltese use it as the unofficial kick-off to the beach season (weather permitting).
Tim