Welcome to the Candy Crush Saga Community
Do you have a question or need help with your game? Ask the Community.
Hello and welcome to the community. I have never heard of King inviting players via the app and there was no event held in Las Vegas that I know of. All Stars was in California, and invites were sent via email or telephone, not via the app.
There is no world ranking of players on Candy Crush, as there are so many millions of players this would be impossible to do.