Chicken skewers for a crowd

My husband and I are hosting a large dinner party where we'll be making chicken skewers and finishing them on the grill. There will be over 300 guests so we wont have time to grill to order. Can we pre grill them, hot hold them in a steam pan and finish them on the grill to make sure they're thouroughly cooked? We'd like our guests to actually see us grilling them without having to wait 10 mins until they're done. Have learned so much from you guys, thanks so much for the help.