Adobe Premiere is a great NLE for these purposes. It has audio synchronization features that assure that your audio and video will stay in sync as long as you record some kind of audio on camera. Just using a camera’s built in mic is fine regardless of the quality since this audio is only used for matching wave-forms to your multi-track concert recording.
But even without these fancy tools. I have been recording concerts for years and have never needed more than a film slate to make sure that hours of separately recorded audio and video are in sync.