I didn't make it this year but I've gone to about four Elvis Night games since they have started the promotion (entirely through random chance - how strange is that?)
I've always enjoyed it even though I'm probably just a little too young to appreciate The King. I was four years old when he died. For whatever reason, the crowd seems to be really into the spirit of things for this game and the other attractions (fireworks, skydivers, impersonators, change in music from the usual stadium noise) have made it a very enjoyable experience. I hope they keep it around as long as it stays a good time.