Icon Comic and Games Convention takes place from Saturday, April 20th, 2019 until Monday, April 22nd, 2019 at Emperors Palace in South Africa. It is the premier comics, gaming and pop culture event for South Africa. They have teamed up with Niantic to have a special Pokémon Go event during the event. Trainers can get some exclusive in-game bonuses including: Pokémon spawns (more frequent Pokémon appearances in the wild) and extended Lure duration.
Sources:
https://twitter.com/IconCGC/status/1116959201740382208 and
http://www.iconcgc.co.za/pokemongoapp-partnering-with-icon2019-at-emperors-palace/