Here's Fully Booked's official statement:
Dear Customers and David Finch Fans,
Thank you all for your enthusiasm and support for David Finch's visit!
We regret to inform you that due to unforeseen circumstances, his visit to Manila this March 11-13 will no longer push through.
We share your disappointment at this turn of events. Likewise, David is also regretful as he is very much excited to meet his fans here.
David Finch will definitely still come to Manila, but at a later date. Please stay tuned for details.