Conversation so far:
Why are the reunions mini reunions?
CANNOTANSWER.
when did the first mini reunion occur?
February 28, 2007.
Where did that happen?
Greenbelt 3, Makati City.
Was it a concert?
the official launch of the book Tikman ang Langit: An Anthology on the Eraserheads (2007) was held at the second level of Powerbooks bookstore in Greenbelt 3, Makati City.

Question: Who wrote the book?
Self-contained rewrite: Who wrote the Eraserheads book?