Northern Ireland is a rather special case, where having a Mass as part of a Fleadh could be expected to offend some people, so that it would be discourteous and provocative. In that particular context, if it were possible to have an interdenominational service instead, that would be far better.

But I don't think that kind of situation of worrying about offending people applies in a whole lot of places, most places in fact.

When we had the first big St Patrick's Day Parade in London last year, it started off from Westminster Cathedral with a special Mass, and it ended up at Trafalgar Square, where there was a special service in St Martins in the Fields, which is Church of England. Both were included in the programme.