While “society” Carnival balls are private affairs for krewe members and their invited, formally attired guests, some krewe fêtes — including post-parade “extravaganzas” staged by Endymion, Orpheus and Tucks — are accessible to non-members. Costuming or fancy dress, drinking and dancing, live music, frivolity and pretend royalty are all key ingredients in the common quest to let pleasure rule.