For the last 12 months or so these "investor calls" have been...

For the last 12 months or so these "investor calls" have been held on the same trading day as the release of the "market update and 4c". Always prior to the opening bell followed by the investor call at 11am.
This release is set for 31/07/2018 and the investor call at 9am the following day (1st August) I am wondering if this is just circumstantial (a one off) ? I will be further intrigued if the 4c is released after the market has closed on the 31st. Am I just a worrywart or what?