The Very Secret Society of Irregular Witches by Sangu Mandanna (2022) Berkely

The witches only meet on the third Thursday of every third month.  And they never meet in the same place twice.  This is very inconvenient, but very safe, or so the leader, Primrose, tells them.  Witches should live alone and stay away from entanglements.  Which is all very good, except their youngest member, Mika Moon, has been asked to tutor a set of three young witches who have been hidden by a very powerful witch.  This can change everything, for the three girls, for Mika, for Primrose, and all the other witches.  A fun read, it combines urban fantasy and romance.