For baptisms I highly recommend going during school hours - daytime weekdays you should be able to walk right in, but early morning, afternoon, and weekend are busy.
Yes you can go at anytime. I wouldn't go to do Baptisms when schools are closed. The youth are there starting early in the morning. Initiatory usually can do right away.
They do have special family times, but they are open all day, I think you can go in anytime.
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