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That's why various posters are asking in various threads, as 5:30PM just doesn't make sense. (not all passengers would be aboard at 5:30PM if the sailing isn't until 8PM, for example, even with requirements that everybody be on board/checked in earlier).
The broader question was the March 13th Summit San Juan sailing a complete exception, or was there really a change made that has been kept on each San Juan sailing after march 13th? Anybody from the March 20 and March 27 Summit San Juan sailings?
Are there other embarkation ports/Celebrity ships where the muster drill is/was held hours BEFORE sailing?
I finally broke down and did a search of all Summit roll call threads for more info.
From the march 13 and feb 27 reports here (and another found in a roll call), it does appear as though muster drill is at 5:30PM on a permanent change basis. From other posts in the roll calls,
-- announcement at 5PM
-- bars stop serving at 5:15PM
-- "attendance taken" at muster drill; those missing the drill must do "the makeup" the next day (no info on what time the "makeup" was done)
-- for one of the recent weeks, the drill was reported over at 5:55PM, so 6PM early dining is/was OK.
More confirmation/info would be gladly received, especially if it is contrary to what I mined from roll call threads.
(I'm on the same Summit cruise as the OP; there is a 5PM roll call-planned gathering that looks to be a little problematic given the muster drill schedule)