Answer:
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
A sport with love and service played by singles and pairs.
If you lose me you may cause people around you to lose me too.
We applaud if you perform well.
What is easy to spot but hard to find?
Said to have fifty shades
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic