The Egg hunt was one of the best! Where you also get to hunt NPC capsules. But a close second is the Crimson Harvest!

Anything that includes Mining Blitz/Resource Wars sites. I don't know what it is exactly, but I really enjoy the gameplay it involves. Each site requires getting a new optimal route done, quite a bunch of micro-managing modules and positioning, and if run in a group, additional coordination. But running them with others increases fun factor 10 at least. Had some good encounters and conversations with random people because of them. I hope CCP brings them back more often.

Winter Nexus event for christmas, free ships, free SP, free skins and loads of event sites to run and to hunt people inside them.

I'll be the voice outside the chorus and say I have no favourite. For the way my character is setup and the way I play, they have such little rewards compared to the huge amount of time and effort I should pour into them, thus making them practically devoid of any enjoyment.

I am well aware that 1) the target player is not me but players much more active inside the game, and 2) the real objective of these events is to drive conversion toward Omega, but knowing that hope doesn't ban me from saying an "unpopular opinion".