This weekend, May 14th and 15th.
There will be 700 or so trucks, customs and hot rods there. They close off 24+ blocks of downtown Riverside to showing and cruising them all day Saturday with 1/8 mile drags at Fontana on Sunday.
I'll be there. Look for the maroon 56 F100 with grey primered hood and bed.
More info:
http://www.showandgo.us/