Great project idea!
hmm ... generally, you would be looking more at which seasons they most typically bloom, and even at that, the bloom period can 'bleed' into the previous and subsequent season.
But, that said, I'm sure we can help with the seasons.
For instance, my Neofinetia (now Vanda) falcaltas all bloom in early summer.
My Dendrobium bigibbum blooms reliably in autumn (usually October-November).
My Den kingianum blooms reliably in late winter-early spring.
My Aerangis citrata blooms early winter.
I'll try to think of more - hopefully others will add!
Good luck!
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