You can buy temporary masks from the creepy tree npc at halloween, but other than that this suggestion has been denied numerous times.
https://perpheads.com/threads/masks.47649/
for balance reasons im almost certain this will get denied + many very similar suggestions have been denied:
https://perpheads.com/threads/allies-of-org.56581/
https://perpheads.com/threads/more-org-ally-interactions.48910/