Sure, you can aerate this weekend. But I would hold off on the dormant seeding until the dead of winter. Here is a link to a very good article on winter seeding by our Horticulture Extension Agent and fearless leader of our Master Gardener program, Dennis Patton. This is for Kansas, where the timing might be different than for PA. You might want to contact Penn State Extension for the timing in Philadelphia.

Periodically in winter, I get a K-State newsletter that explains winter seeding as well. It advises to seed over snow so that with somemelting in sunlight, the seed falls to the soil level, and with a little thawing, it is placed naturally in contact with the soil, even embedding between soil particles. You will have to overseed at a pretty high rate, though, maybe double what you would do in September. Germination rates are pretty low, but as this K-State article indicates, germination rates can vary significantly depending on your timing.

Here is a link that might be useful: Winter/Dormant Seeding, K-State Extension