You would have ruined somebody’s birthday.
The heat generated on the cake will melt the candles and unless you intend to give candle laced cake to your visitors, you would be so unhappy with what happens.
Microwave but you with huge mess.
The cake any favors at certain point those candles are going to melt and leave you certainly wont.
Candles won’t melt in a 1 - 3 minute cooking but anything with sugar is gonna be a mess. And hot!
Keep the kids back.