Holy Cow! Nighttime photography is tough!
Also, using the editing app, Snapseed, to edit the lightning and fireworks is very helpful!
One of the things I am finding in low light situations is that taking a video, then a screen grab within your video, produces pretty amazing shots!
Here is an example from a concert with Ukulele Legend, Jake Shimabukuro, this weekend:
Again, focus when there is a lot of movement is tough, and Jake moves non-stop! (Thank GOD! What a showman!!) I believe that a burst option would also be a great possibility for capturing a great concert photograph. I’ll try that very soon!
I find that the ‘burst’ option (just holding down your finger to take the photographs) while really great for action photography, also produces a beautiful lightning shot every once in a blue moon!
Keep playing around with those challenging night time and dark shots! I know I am going to!