masked ball

ie formal dance at which masks are worn to disguise the guests 化装舞会.

martyrdom, marvel, marvel at, marvellous, marvellous (US marvelous), marvellously (US marvelously), marvelous, Marxism, Marxism-Leninism, Marxist, Marxist-Leninist, marzipan, masc, mascara, mascot, masculine, masculinity, maser, mash, mask, masking tape, masochism, masochist, masochistic, mason, masonic (also Masonic), masonry, masque, masquerade, masquerader, mass, Mass (also mass), mass communications, mass hysteria, mass media, mass-produce, Massachusetts, massacre, massage, masseur,