Typemoon has announced Fate/ Grand Order Adventure Calendar 2019. Basically you will be reward for loging in. The way it is written it will take those who login and then reward them on December 25th when the website is updated. I will post the paragraph below so you can check it out yourself.
“An official website has been opened for the Fate/Grand Order Advent Calendar. As the days tick down to December 25, 2019, it will update with each reward that will be doled out. People who have completed Singularity F: The Flame Contaminated City Fuyuki – Section 3, Part 1 are eligible to start receiving gifts. However, if you miss a day, you won’t get that day’s present. It seems like the gift given on Christmas day could be especially notable, as it is singled out and its box is larger than the others.”
Article:https://www.siliconera.com/fate-grand-order-advent-calendar-2019-announced/
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