The standard thing is that late in the afternoon as the sun sets, there is a mass scurrying to the campsite of people going to get their extra layers. The only thing I find inconvenient about it is that at night when you walk into the session bar with all those extra layers, you have to start peeling them off and either hold them or put them somewhere. I've often found the change in temperature so dramatic that my glasses fogged up as I walked in!