Oh, that was a cross-LS event that we had a few weeks ago. We don't have that many Miqo'te in our own LS. ^^
I think there were maybe about 70 or more people there, but because of the rendering limitation we could only see 40 at a time. ><
Blog entry:
Saronia Summer Beach Party ・ 花火大会
The Japanese player population on Saronia is also quite large with a lot of cross-LS interaction.
Just my personal opinion, but it seems like many of the English speaking players tend to keep to their own Linkshells and largely ignore people who are not members. Maybe they're all on voice chat on 3rd party chat systems too, whereas Japanese players primarily use in-game text chat. The differences are quite interesting. ^^