Answer:
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
Many people own a copy of me. Without me the world would fall.
I am easy to waste and unstoppable
I give light by night, but not by day. I am wicked but not evil in any way. Wax for the most but always wane; except when I'm out, I stay the same. What am I?
Light me up in backyard gatherings
I start with T end with T and within me is T.