How to QUERY() with a column for the sheetname, or sheetnames from multiple sheets.
Important note:
* In the custom array {}, use commas to separate columns and semicolons to separate rows

Sheet (to copy):
https://docs.google.com/spreadsheets/d/1Q0kAwUQkj9i3M3qJMUX9_Fwgkaeo7cc26TRhW0irnIo/edit#gid=1970274019

Formula:
=QUERY({
ARRAYFORMULA(IF(LEN(‘Location 1′!A2:A),”Location 1″,)),’Location 1’!A2:B;
ARRAYFORMULA(IF(LEN(‘Location 2′!A2:A),”Location 2″,)),’Location 2’!A2:B},
“Select * where Col1 is not null order by Col3”)

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