But I thought that was for that gold box last night? Or is this the be logged in every weekend thing?
An attendance event is an event that usually goes on for 35 days (unless there's an extension) and the more days you login the more you fill it up. Rather than say, log in the first day and the third day, you are missing the second but have 1 and 3, you are just up to 2. It has no bearing on what day of the month you are on. Every three days you have logged in during the attendance event, you get a prize depending on how much you have done, in this case an AP potion. http://mabinogi.nexon.net/News/Events/1/00Hru
The event for logging in on both days of every weekend for 10 weeks (20 hot times) is an entirely different event. http://mabinogi.nexon.net/News/Announcements/1/00Hrz
Also going on is a event that you have to complete daily ten times to get a weapon after the event is over tomorrow. http://mabinogi.nexon.net/News/Announcements/1/00Ht9
Hope that clears it up.
Personally, I don't see the 100 AP as unusual. Not only because of past attendance events, but even AP rewards of other daily events. I mean, so far by the 27th day you got 1 10 AP potion, one 30 AP potion, and one 100 AP potion. That's 140 AP. Normally, there are events that run all month and give 5 AP daily, which would mean 135 AP by the 27th day. Is this really so unusual?