This is a good time to test soil pH, aerate and lime the lawn.
One can aerate the lawn any time. In the summer when point to remember is to make sure the lawn is well watered so one can have a good plug. When the ground is hard the aerator doesn’t work as well.
Lime adjusts soil ph. And soils can be tested for nutrient deficiencies.
Some people like to rake up the unsightly plugs; while others chop them up with the lawn mower as a top dressing.
Aeration helps grass roots to grow deeper and also with lawn drainage.