How many pax you looking at?
Is there a lot of older kids? (What about mac party room for about 30+- pax)
Friend's condo function room?
For chalet, getting the Sunday one maybe higher chance.
Some cafe like pinch of salt, eat pray love, food for thought, etc. (but might be slightly high cost or about the same, as chalet + food also about there, if you 60 pax onwards)
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Queen of 1 active son