Doesn’t say which events are needed for certificates?

I've had the same question today. Maybe the quests will show up at the camp. It was that way at the GM Event.

yeah, so which event do we have to finish to get that ticket?

The Daily Mission Event gets you 10... have not found the other 40 ticket source.

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I got a weird situation where I have 12 Event Certificates, yet when I check the shop, it says 0. 
Also, it shows different requirements in the shop compared to the official announcement here in the forum. 
I'd really like to know what's the deal with my certificates.