How do door volunteers check people in without my login?

Give them the door PIN. Set it on the signup's Check-in and safety card. Volunteers scan each QR code with their own phone camera, type the PIN once, and tap Unlock check-in. They never see your dashboard. The phone stays unlocked for that signup for 30 days, and saving a new PIN locks every phone out. Scanning tickets for a play or game is part of EventTicketGo. See What do our door volunteers need?