In person, not just on a call
Mark a round as in-person and pick the venue. The invite carries the address, the date, and a reporting time that can be earlier than the interview, so a site that wants people early can say so. It asks the candidate for their vehicle registration up front, because most offices will not lift a barrier without it. Save the venues you use and pick them from a list after that, or type a one-off address without saving it.
A walk-in drive, without thirty emails
One day, one venue, a lot of people. Tick the candidates you want, choose the date, the venue, the dress code, and who will be standing at the gate to meet them. Each person gets their own meeting invite, with their name on it and their CV attached, the venue as its location and the reporting time as its start, so it lands on their calendar and turns up on their phone. The invites open ready for you to read before any of them go, and nobody sees anyone else’s address.
When the day is over, mark each person selected or rejected from the same board. A rejected group is asked its reason once, before any mail opens, so changing your mind costs nothing. Then the letters go out as one send, ten addresses at a time and all of them in BCC, so a drive of thirty is three emails. Anyone whose email is missing is named on screen before you send: marked rejected, not quietly skipped.