Media Party

Since its been so long since I've done a Media Party for KCRF, does any one know if everyone (i.e. media and guests) shows up early, or do they wait until later in the evening? JS has asked me to be there and has a "call" time listed as 4pm and I just checked and sunset is 8pm that day so I figure "dark" could realistically be between 8:30 and 9pm. Personally I don't see people showing up first thing but that could just be me.

Thanks, just looking for some sort of direction.