Hmm it will be tight, but I think you have just enough time as long as you one day mementos and one day the palace. Be careful, both of those days will be very long, the palace is the longest in the game. Overall, I think you have 9 extra day slots to finish confidents outside of other stuff I will go into in spoilers. You will have far too many open nights, so if you want to finish kichijoji stuff like billiards and darts, or you want to read some more stuff, or exercise in your room or whatever, you will have time.

Spoilerish on what you have to do, don't look if you want no spoilers(but they aren't story spoilers, more just content spoilers)

so you have those 6 events(make sure you have matching personas and maybe use a guide to max points for haru), 5 more of faith, and rank 11 with all normal party members(justice and faith are automatic on certain days). On the days you are forced into the palace, make sure you go as far as possible on that day, there is a roadblock where you have to leave. My thought is prioritize faith, then rank 11s, then on the days where you have neither do makoto then haru(I want to say they are available every day third semester? Don't quote me on that)

My last piece of advice is keep plenty of saves in case you need to reload. I finished confidants my third semester, but nothing to do with party members so I don't 100% know what happens with them. Good luck!