Link to mod: https://www.curseforge.com/minecraft/mc-mods/enhanced-celestials

For full compatibility:
Integrate support for EC's Blood Moon in the "bloodmoon" trigger
Integrate support for EC's Harvest Moon in the "harvestmoon" trigger
Add a new trigger, "bluemoon", for EC's Blue Moon

IIRC, EC already has a system for lunar event ambience. A quick dig through the mod repo should be all that's needed to find it. Good luck mate.

I had forgotten to update the curseforge description, but if you look in the config for the 1.16 version, enhanced celestials already has support with those 3 triggers

Oh, nice!