You have to play in story mode on any Level. You will get the glory stamp and you can get just 5 stamps per day.
Like Nathan said just play story mode until you get 5 stamps
Just to add to what others have already said, it doesn't count tutorial levels, so you have to do at least stage 1-2 (the one with demeter's face) for it to count.
if you read right under event duration, it tells you what you need to do. this is like taking a picture of a stop sign and asking what it means.
Also, just adding to what the other fellows mentioned, don't forget to reclaim the daily prize everyday after you gather the stamps.