Those types of things stemmed from the times of segregation (legal, and later, defacto). By now, they really do not have that reason to exist anymore, but have probably become traditions that a lot of people likely don't want to give up since it's been around so long. They weren't built around the negative exclusion of other groups; hence, they never took on the negative connotations of white groups.
What would be the purpose of white counterparts to those things now? (Generally, each European ethic group does have its cultural events, which are divided according to the nationality rather than the skin color, while the entire black race was distinguished a single group for a long time, though now some of its ethic divisions have taken on separate cultural identities, such as West Indians).