Now we are within 10 days, I am perusing & studying the 10 day weather forecast. Currently, looking good for next week, 81F on Wed & 86F on Thurs both days just 20% chance passing rain which ordinarily means no rain.
I think Rav Lau’s problem is that he is booked to fly to Israel on Thursday, so could not make a commitment for speaking in case Siyum is deferred to Thursday.
Now that this does not appear to be the case, we should IY’H eagerly anticipate his sermon.