The Cape Town Fan Con Comic Con takes place from April 27th, 2019 until April 28th, 2019 at the Cape Town International Convention Centre in 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), extended Lure duration and double Stardust.
Source:
https://twitter.com/FanConComicCon/status/1118801687081299968