According to the announcement released by Twin Peaks Mountain Brewing on March 12, the 4th anniversary event will be held over three days, Friday, March 13 through Sunday, March 15. During the period, the lineup will feature three guest beers from breweries with which it has deepened ties over the past year.

The post text explicitly states that at around 18:30 on March 13, it will tap for the first time "a beer unlike anything before, brewed in a first-time collaboration with the Tsukuba Craft Beer Fest Executive Committee." This makes it clear that the core of the event is not only an anniversary celebration, but also the unveiling of a new collaboration.

This post was published as a joint post, and the account `@sakadukibrewing` (Sakaduki Brewing) is also credited. By taking part in a milestone event on the Tsukuba side, the Tokyo-based Sakaduki Brewing further highlights the horizontal connections within the greater Kanto craft beer scene. Unlike a standard standalone brewery release, this can be seen as a proposal centered on the taproom experience, inviting people to think about not just what to drink, but who to drink it with and in what context.

The post also provides tap information for the day, including multiple styles such as pilsner, kölsch, IPA, and weizen. Because the collaboration tap time is clearly stated, it is an easy announcement for fans who want to drink it on purpose to plan their schedule. As of the time of posting, however, the collaboration beer’s name and style details had not yet been disclosed, so the tap announcement itself is likely to serve as the effective first official reveal.