We leveled low spots and top dressed front lawn area, aerated, limed, overseeded, and put down stater fertilizer.
How often should the area be watered.
Please read initial post below:

My son lives in Central Massachusetts and his front lawn is exposed to full sun a majority of the day. The lawn has severe damage due to a lack of water. The neighborhood of homes was built on an old sand pit.
After a very wet June; July and August have been drier than average and he didn't run the irrigation system enough. Once the lawn went dormant he stopped watering the lawn completely.
He dug a few holes in several places in the yard to see if the damaged could have been caused by grubs along with the lack of water, and he noticed in some spots there are 6" inches of loam and in others only 2" of loam.
He is going to loam over the severely damaged areas and go over the entire lawn with a plug aerator then over seed with a blend of full sun grass seed. Is there anything else he should be doing?
In the past month his lawn service recently put down an application of fertilizer. Can he apply a starter fertilizer along with the over seeding.
Thanks