With the closing off seasonal events it was made clear that the gear from these events would be made available through the tenants, but as it stands the masquerade mask and it subsequent ornaments remain unobtainable.
I really feel these need to be added to the tenants or changed into universal ornaments that get disabled in Pvp (like with exotics). People did pay money for these so it's a shame to not have them accessible.
-
Luckily, I kept a zero power FotL mask for each guardian so I can run around as a chicken in random matchmade activities. (I also have the original zero power "damaged" set from day one of Destiny 2...for fun! It's well worth the spaces they take up in the vault.)
-
I believe you can get them by focusing bright engram