"Possibly relevant professional events" are the 5-10% of what you need to do. Most of those events are just drinking and schmoozing with little benefit and even less follow-up.
Have you identified potential places of employment? Have you posted on relevant local boards? Have you called up/met with any recruiting centres that focus on Philly? Have you contacted the HR departments of companies that may fit? Have you spoken with the Philly board of trade/commerce? And stretching out, how about the local chapters of the Knights of Columbus/Shriners/other social groups? How about your university/college alumni? Facebook? Have you extended your possible career choices to include teaching at a community college (I know one guy who did that)? Have you checked with the city and what jobs they have (municipal governments are all hiring IT guys these days)?
There are lots of ways to find a job. Sitting in front of your computer, browsing Monster/Craigslist/etc. is not the best way. The holidays definitely put a crimp on opportunities available right now so you should, IMO, be taking the initiative to introduce yourself to those who may have openings in the next couple of months. First the introduction, then the reintroduction after the holidays. That shows drive, determination, and desire.