Wedding breakfast
The first meal a couple eat together once married: usually the sit-down meal after the ceremony and drinks, whatever time of day it is.
Despite the name, it's rarely eaten in the morning. The phrase comes from breaking the fast, and it's the main meal of the day, with the speeches often just before or just after it.
It's usually the longest fixed part of the day, so caterers will want final numbers, meal choices and dietary needs a few weeks before.