Credo is an academic alternative to Wikipedia. It includes topic pages with mind maps (example: Mask) and specialized entries from several encyclopedias, dictionaries, and other reference sources (examples: Noh from The Cambridge Encyclopedia of Stage Actors and Acting and Carnival and Sexuality in Brazil in Global Encyclopedia of Lesbian, Gay, Bisexual, Transgender, and Queer (LGBTQ) History. As a reference source, it's a good place to start and to help formulate your topic.
Try some of these subject headings in WorldCat:
Masquerades | Carnival Caribbean area | Festivals | Masks Symbolic aspects | Mask making | Masks social aspects | Identity (psychology) | Disguise | Masks Psychological aspects | Masks religious aspects | No masks | Masks, African | Carnival