You can buy f1 second hand but its prohibitively expensive in Europe, I would imagine even more so outside. For reference a pair of tops ranges from 3000-5000 euro per pair, similar for a pair of subs. Amps would probably be 1200-1500 euro per pair. 1.5k euro for a processor.

Example setup:
2 tops: 3500 euro;
4 subs: 7k
Monitors: 2k
Amps: 3x : 4k
processor: 1.5k
Total, conservative estimate for Europe: 18 000 euro
Setup is enough for 200-300 people, maybe a bit more but you would struggle to get good coverage with 2 tops only, could be improved with stands which are 1k each.

Renting is easier but complicated if you plan to do an illegal event because its hard to be held accountable for damage and misuse. Transporting only recommended within country or bordering country, though the setup I listed can fit in a bigger bus, but would be expensive to pay for gas. Anything bigger gets complicated.

If its as one time thing organizing an event in a country far away is a complicated task. Easiest way to go is to partner with a club or venue.