[Disclaimer: I do not have the current edition of the Paulist Press ordo, and so I cannot say for certain what date is listed for the anniversary this year; it is possible that it has been changed, but I am doubtful. Certainly, I have seen nothing in the Cathedral parish bulletin about celebrating the anniversary on any date in April.]
April 28 is in fact related to a significant historical event for the Cathedral – a re-dedication – and so is an appropriate date that is at least in the same month as the original date, and which would be much more predictable than the April 9 date. Bishop Vasa had intended to mention something about this in the Diocesan newsletter the following year, but since he was transferred to the Diocese of Santa Rosa, the clarification fell by the wayside.
Prior to that, in October of 2007, Bishop-emeritus Thomas Connolly celebrated the 60th anniversary of his priesthood, and at that time, in the presence of a couple of archbishops, several bishops, and numerous priests, the newly renovated Cathedral sanctuary was "blessed and re -dedicated", according to the now-defunct Cathedral parish website, which may have been the best parish website in our diocese - well worth perusing even now, though it is not the official parish website any longer and is not updated. If you follow that link, you will come to the old website which contains many wonderful photos on various pages of the site.).