Parks with shelters with grills work really good.
Whoevers hosting, bring some hotdogs and some buns and some cheap soda/water from Walmart. Not Coke/Pepsi, just the cheap store-brand stuff. Set up a time and location a few months ahead. When I was helping with the EF meets in Tampa, we did it Sundays from 10am to whenever (usually cleared out around 4-5pm). Set-up a nice cooler with ice for the drinks on a table under the shelter, with some free community stickers and stuff. When people started arriving/getting hungry, we had a designated grill master get things going. If your hosting the meet, talk to everyone atleast once or twice. Introduce yourself, say hi, try to start conversation. Consider buying those "HI, my name is _____" name tags, and write your username, then a "aka" and your first name. Works well to break the ice/identify people you don't know in person (or when you can't remember their name!).
Parking lot meets don't have the same feeling that a meet in a nice park does. I don't know why, but small park meets are just nicer. Most small bi-monthly CRX/EF meets that have stuck around have been in parks, with a shelter/food set-up.
Also, expanding it to all EF's gets some more people involved. Just CRX's is nice, but it can be damn difficult getting more than five people with CRX's to show up, and it gets a little bit boring when there's only five people.