A multicultural ceremony has characteristics to that of a bilingual ceremony I.e., particularly tailored to a couples culture and traditions. However it is not necessary to communicate in different languages; in all cases. Take for example a couple of Jamaican and British origin with different cultures but the same common language of English.  Or a couple of African origin and British/Caribbean origin; with African dialects and languages but where English is also widely spoken.  The beauty of multicultural weddings are the multitude of variations they may bring.  Because they are so focused you can show off and be proud of your heritage with your closest family and friends.