Conversation so far:
Why are the Eraserheads reunions called mini reunions?
When did the first Eraserheads's mini-reunion occur?
The first Eraserhead's mini-reunion occured on February 28, 2007.
Where did the first Eraserhead's mini-reunion happen?
Eraserheads' first mini-reunion happened at the official book launch of Tikman ang Langit: An Anthology on the Eraserheads (2007), held at Powerbooks bookstore in Greenbelt 3, Makati City.

Question: Was it a concert?
Self-contained rewrite: Was the first Eraserhead's mini-reunion at the offical book launch of Tikman ang Langit: An Anthology on the Eraserhead a concert?