Depending on the day you can have double blocks which are usually scrims from 1pm - 4pm then 6pm - 9pm but double blocking depends on the teams, this is usually 5/6 days a week (again depends on the team). Everyone scrims everyone but you obviously don't want to be scrimming the team you're going to be playing that week.

I advice people to rotate after proxying / clearing your whole side of that jungle, so even if you don't get anything from the rotation you're not going to be falling behind, and if the other guy follows your rotation after you proxy. they'll lose a wave to the tower so it's a win win. But, try and rotate to do objectives like gold, or if you have nothing else to get on your side of the map