How are guests supposed to know what to wear to the weddings they are invited to? Not to mention that there are daytime weddings, nighttime weddings, formal, informal, and semiformal weddings.

Here are some top questions and answers for couples and their guests:

Q: Is there a rule for the start time of a black-tie wedding? I’m getting married in June, when sunlight will last well past 8 p.m. Is it OK to ask guests to don black-tie attire if my ceremony starts at 5 p.m.?