is there like a website or an app that tells you where they have destiny tournaments or casuals near you?

I built weTabletop for this exact reason!

weTabletop is the event directory for tabletop gamers. You can access a comprehensive directory of where to play your favorite games, quickly find your next event most convenient for you, and stay up to date with your new favorite store’s event calendar.

Here’s Star Wars: Destiny’s event page: https://www.wetabletop.com/games/7

Enjoy! 😀

We don't have any tournaments here in the Philippines so can't help