Guild Wars 2

Could we get
Essence of Mischief
Essence of Snowfall

from the Mystic Forge after wintersday?

yes

The Essence of Mischief, Essence of Snowfall, and Magnanimous Obsidian Crystal can be created in the mystic forge year round. The Festive Imbiber achievement (for consuming 10k holiday drinks/tonics) can also be completed year round.

For everything else there’s mastercard you must complete them during Wintersday.

Thank you SOO much