Without knowing anything about your recording or the style of music, etc., it seems very unlikely that simply normalizing the entire concert recording will yield good results. It is typical to apply level adjustments (at minimum normalizing each segment) separately to each song and each speech segment.
It may be that normalizing the loudest songs and maybe the speech to 0dB Full Scale may be appropriate, but only you can make that decision because you have the video and audio to work with and know what the music should sound like. You probably wouldn't want to normalize ALL the songs to the same level. Unless they are all max-volume head-banging heavy metal or something. :-)