An evening wedding... I would not wear black b/c I'm not a fan of black, but I would wear a dark color cocktail dress. Unless the invite says "black tie" or something along those lines, then "after 5 party dresses" are the appropriate attire. Brightly colored spring dresses would not be appropriate for an evening event. At someone's wedding, only the bride should "pop"- everyone else should really be understated and "blend".
It is okay to wear black to a wedding, but not okay to wear white! When we got married one guest's date showed up in a strapless ivory dress. Very tacky and yes, there were many "tongues wagging" about how inappropriate that was!