The latest live event for Pokemon Go is a test of strength. A special "Battle Showdown" starting today makes Fighting-type Pokemon appear more frequently, gives you some extra XP for battles, and offers other incentives for visiting Gyms.
Brawlers like Machop and Makuhita will show up more in the wild. Through May 14, you'll get a double XP bonus for Gym Battles and Raid Battles. Raid Battles will also grant a guaranteed 3,000 Stardust just for playing, and you'll get at least one Rare Candy for a win. Gyms are also getting various bonuses, like a double Badge multiplier for visiting one that you visit frequently. Spinning a Photo Disc will get you more items as well.
Pokemon Go has received pretty regular support since launch. Most recently it wrapped up an Earth Day themed event with Ground- and Water-type monsters, and gave bonuses for participating in special clean-up events. After this fighting event wraps up, the game will host the May Community Day. That will feature a Charizard, and Lure Modules will last for three hours. You'll also get triple Stardust for capturing Pokemon.
The May Community Day kicks off on May 19, and the time will vary by region. In the US, it starts at 11 AM PT / 2 PM ET and ends at 2 PM PT / 5 PM ET; in Europe and Africa, it will place from 10 AM - 1 PM UTC; and in the Asia-Pacific region, the event lasts from 12 PM - 3 PM JST