When will people be allowed in the venue? Will people be reasonable expected to have eaten dinner prior to the event? With the Santa Maria grill you have great 'eye candy' and having tri-tips on there will turn on the taste buds. Tri-tips cook quickly so you can plan for 100 early eaters and if they go fast just keep adding tri-tips as you see how many you sell. If you don't sell out early you can use the tri-tip chopped for the tacos.