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The makeshift one usually at open event space.
Like those at open space at Taka or Vivo

Oo I heard taka one no longer exist this year. The novena one is much smaller scale. Only about 10-12 stalls inside only

I think all the open space even is banned. Even the Cake History store in Toa Payoh which used take the outside space regularly is not having it this year.
I think they are trying to go indoor but that creates a a big box of non-circulating air which is a problem like what happens in a Starbucks in Korea recently.

Haha no idea. Novena square one is indoor event. It's just using empty shoplot to house the Mooncake sellers. Maybe that's not against the laws?