Yes.

Are they completely gone when it comes around again? Or do the ones you gave over to the shop still remain and are usable?

The Masquarade shops are open all year long (you can find them at Atebus), so your trinkets will remain usable, even if you keep them untill next masquarade :)

Last year, they stayed. And since all mine are still available to be used, I'm gonna assume they'll stay this year too.

:O It's open all year around!?! rushes over to atebus Well so it is!

Haha I'm glad I'm the bearer of good news!

&

Thank you! I won't use them all then! :)