It doesn't actually matter when they have moved the holiday to, as that is to give most a long weekend. It's the night before the Prophets Ascension that is dry so Tuesday night 3 May will be dry.
It is my bday on the 3rd and when I rang two bars/restaurants yesterday they are saying they are dry on the night of the 3rd, so not sure why as the holiday was moved to the 5th.