U.R.F and other game modes date

I recently found this on LOL-PH page about the game modes !. The ascensions is from 8/4/2016 till 10/4/2016 2. The Poro KIng mode is from !5/4/2016 till 17/4/2016 3.The ULTRA RAPID FIRE is from 22/4/2016 till 24/4/2016 4. HEXAKILL!!!!! from 29/4/2016 till 1/5/2016