i have tried max's but for corporate activities.. so far, they are okay.. you can try max's jupiter in jupiter, makati.. function rooms are in the 2nd floor.
you may want to check-out gerry's grill in jupiter. i think they can accomodate 150 pax (the entire resto). but if your guestlist is about 50, they have a function room. what's good with gerry's jupiter is that the resto is new.
try aristocrat in jupiter also. their 2nd floor can accomodate 70 pax. very colorful and vibrant, it will be pefect for a kiddie party. they can provide your cake too.