I have no idea how to do the event.

Get your free seed and or buy some. Plant them on the event page. They take 3 days to grow and you must water them at least once. You will get different items depending on which days you water, which days you fertilize, etc.

That's going to be so hard to collect all the items ^^; I really just want the wearables.

Well give it a few days for folks to figure out combos and make a guide thread, and then you can just do the ones you want for the items :D

Yeah that's true lol.. I'm probably going to end up buying most. XD I don't have much time atm.

How many times you water changes it, yes, but not the days the plant is watered
Fertilizer will vary on the day(s) chosen

Aren't all the items wearables? xD

Well, there's Knuffel room items, also. XD

Can't you only water it once a day?

OH ARE THERE? xD I didn't realize that they'd have room items too! XD

yup only once a day for watering, the only thing that affects what items you get is the fertilizing I think...:>

You don't have to water it every day though. You don't even have to fert every day. You could water one plant once and not touch it after that, and get an item.