Badump Date Super Plan
The main protagonists of Fate/Stay Night and Tsukihime meet and discuss their problems namely how they can accomplish dating all the heroines of their respective games on the same day.
Aired 12/08/2011EP 4 - Badump Date Super Plan

Carnival Phantasm
The Carnival Moment is a time when several narratives from Type-Moon's famous works intersect. It happens every decade in an entirely new dimension, and those who have never run into each other can meet. And what's more, all individuals involved gain the opportunity to fulfill any of their wishes! However, they will have to come a long way, as they will need to partake in contests.
In Carnival Phantasm, various characters are put into situations that ridicule their own worlds. Nevertheless, they all have the same objective: to win the contests by any means necessary!
(Source: MAL Rewrite)
Note: Adaptation of the "Take Moon" manga series by Type-Moon's Eri Takenashi, created to celebrate Type-Moon's 10th anniversary. It features parodies and new stories loosely based on Type-Moon's original works, including Fate/stay night, Tsukihime, Melty Blood, and more.