No you dont need a reservation for a party that size....i took my 3 yr old daughter whos about to turn 4 she had an awesome time watching them prepare food and watching her trying to catch a shrimp was a riot

They offer an early bird special which is about half price on the normal menu items selected and most are Wednesday through Saturday

Wed, Thur, Fri, Sun

If you really want to enjoy your experience I would say to make a reservation for 7:00pm so you have plenty of time before they close.