Yes, but... in order to access protected resources (like the rehearsal schedule), performers must have their own user account and be on the cast list for a show. So while you can skip auditions, doing so deprives your cast of some useful tools and will needlessly complicate your process.
Privacy-First: In addition to capturing conflict calendars and automatically importing them to the rehearsal schedule, your show's audition form is how performers give their permission for directors to view and use their private information.
You can start adding rehearsals to the schedule right away once you post a show. Create a list of characters and groups in your show and assign them as attendees even without a cast list! But if you need to navigate conflicts, cast members must submit an audition form* which is how you'll capture their conflict calendars. Add them to your cast list to unlock cast resources for them (like the rehearsal schedule).
In addition to capturing conflict calendars (so you don't have to manually enter all that), your show's audition form is how performers give permission for directors to view and use their private information. Privacy is paramount.