I started this test game about six months ago. My aim was to test out just how far the game would let me progress before I would run out of gold. I must say, this has taken me utterly by surprise. I thought now with timed only boosters and legendary levels I'd grind to a halt long before now.
This is not what I was expecting to find!
But here's the verdict: It is indeed possible to play Candy Crush and enjoy the game, without adverts and without spending any money. The events really do give us just enough boosters and gold to keep us going to reach this jolly milestone.