Modern etar (as in the version that is most current in FDroid) has the ability to setup recurring events (every day, every two weeks, etc.) Is that what you mean by "repeated reminders"?
Font setting, no it does not directly have font setting inside the app. Instead it follows the phone global size set under the accessibility area of the global settings app.
no, repeated reminder will pop up in set time and if there is no input it pop up again in five minutes and then again and again
in Business calendar i use 5 times 5 minutes but you can set whatever frequency and amount of repeated reminders, seem almost no calendar apps have this killer feature
Font setting, no it does not directly have font setting inside the app. Instead it follows the phone global size set under the accessibility area of the global settings app.