I'm looking for your insights regarding organising a high school reunion in summer 2017. The number of attendees will be between 30 and 300 and they will travel/have passports from all around the world, including developing regions. The ideal location would be safe, visa-friendly, affordable, and have an enjoyable climate in August 2017.
The discussion following a SE Travel question Visa-friendly country for an international conference? seems to suggest Singapore, Hong Kong, Netherlands, and Dubai as top choices for organising an international conference. I wanted to see whether you'd vouch for these suggestions for a reunion in August 2017, or propose another destination considering that we're aiming to keep attendance costs low.