What two major events in Shakespeare's A Midsummer Night's Dream occur in 4 days?

When A Midsummer Night's Dream opens, Theseus and his fiance Hippolyta are preparing for their wedding day which is in 4 days on May Day, or the first day of summer. In Shakespeare's time, May Day was a day to welcome summer with singing and dancing. So as the play starts, the audience is informed that the setting is during the summer and that a very important wedding of a high-powered official is soon to happen. This should be a time of celebration and happiness. However, Hermia, when first met, stands before the Duke in tears because she is being forced to marry a man she does not love. Immediately, the contrast between the time of year and the plot presents the audience with the plot.

In A Midsummer Night's Dream, what major event is set to take place in 4 days and why?

Theseus and Hippolyta are to be married in four days, at the new moon. This is politically important, for Theseus is the Duke of Athens. Since the leader of the land is, symbolically, its father, it completes a symbolic union for him to marry. Since he won his bride in war, we can take this as concluding/resolving the war between the sexes. It is also a cause of all kinds of celebrations…such as plays put on by working men. The marriage is important for all of these reasons (and for its intersection with the gender wars in the realms of fairie).