Nope, only the incest restoration mod, which solely edits some text, AFAIK. And I did use it in 19.1 as well.
As far as I'm aware there is no real reason, actually. DC started this whole thing by doing a few "Roxxy" doodles to have something he could teach himself coding with (that's why she's the title girl, though she actually only got her name and became an ingame character a bit later). When some people liked it, he added MC and started the game, including the name. I wouldn't even be surprised if its only called Summertime Saga because DC actually released the first version in august.
Same issue here, already did the bikini contest event, now it repeats and wants me to give Roxxy the bikini again, even though it's not on the stage anymore.
Not yet, no. She'll be part of the next teacher update - once it happens, that is.
Well, those "monthly" updates (and even those weren't really monthly) didn't happen for more than 2 years now. The average since is indeed about 10 weeks per update, while some took more than 4 months, other, shorter ones little more than one. So ~3 months is a good indication but it'll always depend on the content and quality of the individual update.
Judith will probably be the last update. Even Kevin will have an update before Judith.
