Aside from KidZania, are there any other similar places within the metro that is open for private events?

I'm not entirely sure how far you're willing to travel, but I found this list that has LITERALLY every place I would suggest other than KidZania. I'm assuming that at least half of them are open to private events, though, I'm sure some of the parks don;t offer private events. Check it out, but I hope this list helps: http://www.pep.ph/celeb/lifestyle/31892/10-amazing-play-spaces-in-metro-manila

Hi Janine! Why not try Fun Ranch? They have branches in BGC and Ortigas. Visit their site for more info: http://www.kidsrulehere.com/ I've attended kids parties in their Ortigas branch and it was super fun---for parents and kids, alike! Here's a link to their party packages: http://www.kidsrulehere.com/party.php?venue=ortigas

Jump Yard in Ortigas. They also cater private celebrations, too! Here's their party package. You may also check their site at jumpyard.ph for further info