During the soundcheck process, place your mic in a stand and adjust the height and placement that works for you. You want it to feel comfortable so you don’t move around too much (or your voice track will sound like it’s fading in and out). You should also be mindful of your input levels. Check to make sure you’re not clipping when you’re singing at your loudest.
Radio City Music Hall is such an iconic example of a high-end, large-scale venue that most musicians drool over, but I think I’d have to say that the venue I’d most like to play anywhere is actually Red Rocks in Colorado—it just looks so breathtaking and like a place people really appreciate art and open themselves to the whole experience of the show.