Actually Elements on Wednesday at 230 is usually very empty. The starbucks there is quite big, should be alright to cater 20 ppl (at least won't be that awkward if we all 20mama +strollers show up at once). Otherwise there is a Cafe Habitu (next to the ice skating rink) there but is quite small.
And for the podium, it is surrounded by up-market restaurants and bars there, I am worried babies may not be able to get in due to the drinking license (rough guess).
Starbucks is more casual which means they won't bother us much lah, right?
I have been to Element for 1 time during weekday (but not to Starbucks that time) & found that really less people there. Also, my friend went to Starbucks of Element today, saying that it is really spacious that can carry 2x adults + babies should be no problem, but we have to divide into groups, around 4 in a group according to their original setting. We can put the strollers outside Starbucks (spacious). No need to count me for the stroller, because I will go there by bus, so can't bring stroller.