The big rush

Why is it that everything needs to happen before Midsummer? Summer lunch, closing dinner, kick-off meeting, closing meeting. The weeks running up to Midsummer also spill over on the week after Midsummer to then turn into in a complete standstill. From the second week of July and onwards the sea is calm. Nobody wants to be disturbed by anything other than "their own stuff" that they know they have to baby-sit over the summer. Everything else can wait for a month. Interesting behaviour. Very different from the UK; whether it's good or bad is another matter. Right now I'm not sure.