They save seats in classes regardless of whether orientation and registration are early or late.
Overnight allows informal opportunities to meet other students, stay in a typical dorm.
I’ve known of students do two day, one day; others virtual.
One summer an orientation session was interrupted and ended early bc of thunderstorm and power outage.
If virtual ends up being best, you could also look into moving into dorm early. Kids in marching band, fall sports, some campus jobs like with reslife move in early.