If you look at the passport application form, it says provide original or copy of citizenship certificate (if certificate issued after February 1, 2012), with note (right below it) that says "Note: Copies of Canadian citizenship certificates are accepted if the certificate number begins with a K or an X."
This is pretty simple to interpret: substantially all* citizenship certificates issued since February 2012 have certificate numbers beginning with K or X (and as far as I'm aware, the barcodes). Meaning IRCC ('the government')/the passport office itself accepts the certificates in copy. And who else apart from 'the government' is ever going to ask for the citizenship certificate (or insist upon original)? (Almost everyone is going to just use their passports, as a better-known doc, but if anyone else does ask for citizenship certificate, they're going to take photocopy.) Most can pretty safely store their citizenship certificates away in a safe place (keeping a scanned copy in electronic form for use), and forget about it - effectively forever. Of course I can't guarantee there won't be some potential use where original required, but should be very rare / corner case that's not worth planning for. Just keep your passport valid and current.
*I assume all issued since Feb 2012 are of these series, and the 'of certificate series' bit is a just-in-case some errors occurred during crossover (or possibly a protection against fraud or some other obscure reasons); if they ever need to introduce more series, they can just update the instructions above to add an extra letter.
If your trip is short, just advise of the dates of travel and ask for rescheduled ceremony. That'll likely get the fastest rescheduling.