Hivefest was held in Mexico last year but I think not many people in general attended.

I'm sure the organisers would love more people to attend, but if you look at local meetups in general, I don't believe anything has ever happened in countries like Nigeria or India that you mentioned. I'm not sure if the users aren't interested or if the cost of domestic travel makes it unaffordable for many. In which case, holding Hivefest there wouldn't make any difference.

You also have to consider logistics for the organisers and attendees, such as visa requirements, general safety, political and economic stability. Visa applications to Nigeria needs a letter of invitation from the host, who can provide that in Nigeria? Venezuela has hyper inflation making budgeting very difficult.

In my opinion, Hivefest is less about gaining new users but more about retaining users. I don't know if you've been to a Steem or Hive Fest before but I find many attendees aren't very active on Hive but they enjoy the face to face annual meetup. Many aren't devs, just users who value the friendship developed on the chain and are keen for Hive to keep going.