Such contests are not popular in many countries, but some could arrange such among their friends at various parties. I have never taken part in such contests and I have never even seen with my own eyes that someone conducts such a thing
The only way I can watch people participating in eating contest is on Facebook. I haven't participated before and I won't try it because I'm not a foodie.
I don't have any interest in having eating disorder because that's the only thing that I can see happening when you take part in such eating contests often.