The SHAMROCK 5K is a super fast, USATF certified race in Baltimore. It's definitely a PR course. Last year I went through the first mile in 4:32...and I was in 5th place!! They cap the race at 4,000 and it fills up very quickly. It's run in the afternoon just before a huge parade. After the race we drink Guinness and whiskey without shame.
I am sending my form in TODAY via Active. Prices go up $5 after Saturday and usually it fills to capacity shortly thereafter.
Also, there is team competition. I think this is new this year. Please write "Georgetown Running Company" on your entry form if you plan to do this race. So far it looks like Hughes, Bain, Reaves, Double C and Melissa have expessed interested.