As a younger pup I worked at a golf course and we used to aerate and topdress the greens twice a year... it might be overkill for a personal lawn but doing it once a year definitely wouldn't hurt. As mentioned before, the fall is better for the deeper core and the absorbtion of all the winter/spring moisture.
If you have a bumpy lawn there are a couple things you can do. Soak the area with water really well and run a roller over it a few times for a couple days. This will only work mind you if your lawn isn't really compacted, hense do it after you aerate. If you have really noticable dips/depressions etc. throw down some topsoil in the depression, roll it again... you can throw down about an inch deep and the grass will grow right through. Repeat as necessary. roll every day for a week or so and keep the rug rats off the area.
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