There is a Greek festival that my family goes every year at the following address:
St. Katherine's Greek Orthodox Church
722 Knob Hill
It started yesterday night (the 14th) and ends the 16th at night. The usual stuff is there: food, music, crafts, things for kids, etc. I'm pretty sure it ends tonight around 11pm. Closes around 8pm tomorrow (sunday).
I would say that the food is good, but the sweets, especially the loukoumathes (honey Greek doughnuts), are really good. They make the festival for me. I don't think I'd drive from Pasadena or Sherman Oaks to attend the festial, but if you are in the area or a 10 mile radius, I would say it's worth your while.
Check it out!