May 12th coincides with a Thursday in 2016, and then not again until 2022. In 2016, May 12th is a week after Ascension Thursday, and a few days before Pentecost. That would be a fitting time within the liturgical calendar for the Miracle.
Subsequent years (2022 or later) when May 12th is a Thursday are much too late to be the date for the Miracle.
Roman Catholic theologian