So, will themed pets from the holiday be available next year for this holiday, or are they a one time thing?

Zone themed pets are typically on a two-year rotation, so next year themes like starscape zolnixi, patient petunia vulnyx, and storm herald nytekrie, which were first introduced last year, will be retired, while themes introduced this year, like the potted plant vulnyx, crested gecko draeyl, and spring night kelpari, will remain, joined by a new set of themes.

Exclusives, like the cornflower vul, dutch tulip faelora, and balck barlow griffi will probably be retired- that the exclusive themes from last spring fest- like Strelitzia Reginae Puffadore, and asiatic lily qitari- are obtainable again this fest is an outlier to the norm.

Often, themes (usually zone themed) become available for one more year--but not always!

Some themed have been available multiple years, while others have been one-offs. No guarantees either way. Some of the earlier themed have even been re-released with different colors (but the same name)!