1. It was so inconsistently applied on building VS its requirement, that it was faster to remove it for a timehey, anyone knows when I can construct buildings like town hall or jeweller in cities below size 3? I'm almost sure that some days ago there was min size 3 requirement, but maybe remembering wrongfully. today I noticed I could construct these in sizes 1-2
edit: question 2, how do you get city celebrating (0 maintenance cost)? I feel like it's random
2. It happens if happiness is higher than unhappiness, so always. Then it has random chance of triggering it.
similar example would be exile practices which can spawn barbarian exile and that's why I normally didn't build it, lack of obsolete or replace means that it will appear at the beginning of build tab while trying to construct anything in city even in galactic-cosmic eras, although not a problem if I switch to automate city governor