The post from 2020/03/26 (
https://www.elderscrollsonline.com/en-us/news/post/57851) is confusing.
A quest for a "new Jubilee Cake 2020 memento" is described, using the quest starter available in the crown store. I attempt to purchase this quest starter, and am informed that I have already completed the quest. Eating this unavailable cake memento is supposed to award a 100% XP buff and 3 event tickets. Instead, I receive 3 event tickets by completing a daily quest from one of the Jester monarchs. Participating in various actions is documented as rewarding an additional 2 event tickets; one of these documented actions is killing a delve boss, but this awards no event tickets; apparently only 3 tickets per day are available. Various daily quests, including daily crafting writs, are supposed to award "Jubilee Boxes", but daily crafting writs award no "Jubilee Boxes". The Impresario is described as offering "Jephrine Paladin Outfit Style pages" for purchase; these items are not in evidence at the Impresario.
In contrast, the post from 2020/03/19 (
https://www.elderscrollsonline.com/en-us/news/post/57835) appears to be much more accurate. No mention of a cake memento, the player is awarded a "Pie of Misrule" memento, which awards no event tickets but does award a 100% XP buff, the quest starter is to guide you to the Jester monarch pavilions in the 3 faction zones (where the monarch quests are available), the first Jester monarch quest completed each day awards 3 event tickets (explicitly stated), there is no mention of extra event tickets, no mention of "Jubilee Boxes", no mention of bogus Impresario items, and etc.
As I say, this is confusing. I am ignoring the 2020/03/26 post.