In the past we had a lot of small events using the event tracker. That system was really cool even if some people abused a few events.    
So I think there should be care about what to choose as rewards. I list a few of my ideas down below.  Bad rewards (Don't give it as reward because people would abuse it)
 
		Joker Box
	
	
		G1C
	
 Good rewards (Nobody take a big advantages and cannot abuse that event using other accounts)
		Gear Selector
	
	
		Weapon Skin Selector
	
	
		(10 Days) Weapon Selector
	
	
		Clothing Item
	
	
		100-200 Joker Tickets
	
	
		Title
	
 Event examples
		3 Blow Torch Kills - 200 Joker Tickets
	
	
		20 Sniper Kills, 10 Pistol Kills, 2 Grenade Kills - Gear Selector
	
	
		10 Pistol Kill in a row (Killing with other weapons interrupt the progress) - Title