How did I get this free 6* Kang?

I see it in my inbox saying it was a completed event. What did I do for this?

Comments

Did you spend a lot of units on the July 4th deals?

Did you spend a lot of units on the July 4th deals?

Ya. Oddly enough I don’t recall those as prizes

It was a special solo event. Kang was a prize for 18k units i believe. 22k was WPX and 36k was Jessica