I was invited to a large-scale Bolivian conference targetted at computer science and engineering students. Attendance was close to a thousand people, from the nine departments of the country, and a very nice conference overall. It was the 13th annual conference, and it rotates between the country's main universities. The organizers are not the students themselves, but the university's authorities.
One of the main social highlights of the conference was a beauty contest. Each of the nine regions picked their girl to represent them, and they posed for everybody. I didn't want to attend, but was requested to do so, as we the international guests would have the honor of being the judges.
To be honest, I wish I had not accepted. It just... Felt bad. Even though I was the only one in the auditorium I could see that didn't like that.
So, I don't know if it is more prominent in FOSS, or it is just coincidental that Bolivians accept beauty contests more than me (I was told it is a pretty common thing), or what... But it happens in that setting as well.