Christopher Street Day (CSD) is a party,

 commemoration and demonstration of the lesbian, gay, bisexual, transgender and their supporters. It is celebrated and demonstrated for the rights of these groups and against discrimination and exclusion. The name Christopher Street Day is usual only in Germany and Switzerland. In Austria is the move Rainbow Parade, in English-speaking and Latin countries is usually spoken of Gay Pride or Pride Parades, and in Australia, the parades have been mixed with the carnival tradition and called Mardi Gras ("Fat Tuesday ', meant originally the Shrove Tuesday) ,