Add two "Random" ingame events w/o breaking the game

Event 1: The Void Activation method: once two zz'rot portals are placed ( Both blue and red must place two for a total of four ) the event will trigger Effect: Hostile voidgates spawn randomly around the map creating powerful creatures that will attack anything that comes nearby ( This includes creep camps, Minions, Super minions, Dragon and champions but will steer clear of baron and rift herald also these voidgates will not go near active turrets but have a chance of spawning nearby destroyed turrets

Event 2: Weather ( Thunderstorm and Icestorm ) Summoners rift = Thunder and ARAM = ice Activation method: Random 35% chance to activate at a random point ingame effect 1: Thunderstorm Thunderstorm reduces vision by 25% and applies a global slow for the duration of the storm How greatly the slow effects champions is randomized with a maximum of 30% global slow

Effect 2: Icestorm Icestorm greatly reduces movement and vision and can damage champions who venture too far from the safety of the nexus damage is increased by distance from nexus to maximum of 1.5% HP per min

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Now I'm interested to see what you'll comeup with ;) post your events down below if you cannot think of two simply post one :)