How can I make an event go viral?

I see all these events going viral... How do they do it?

It says invite all your friends for a better chance of winning, etc.

you basically just answered your own question

Promise something if get certain attenders, ask those invite other friend. Basically organize something that lot ppl want attend.

The easiest way is to make the people who see it want to share it with their friends - they'll either do that if they find it really funny, dramatic or such a great idea/offer that they think they're friends would appreciate it. Of course, all of that is easier said than done... lol

Offer free beer!

have the attendees outnumber the maybes buy a couple hundred / thousands...

do this by occasionally deleting 'decliners' and deleting SOME maybe clickers .... therefore the number of attending will be higher than maybes and not attenders....

also, ask ur friends to leave positive comments....

these combined will entice people to naturally click attending on events. ive done it plenty of times. having a shitload of not attenders does not put money in your pocket. Delete them, but keep the not attending number realistic though.