@sytron DD's college had a parents' tea. Due to having to cart all DD's stuff around, the dress code was most definitely informal. The Master hosted it in his lodge and senior staff were on hand and obviously primed to chat to parents. Younger siblings were encouraged to attend but one you had eaten the cake & drunk the tea, listened to a welcome message from the Master, you were gently ushered on your way so the next cohort could come in.
We didn't have drop off slots for DD because her college has some parking on site. It was still manic, but we did manage to get a space. We didn't have any help with carrying stuff but it wasn't too bad. I think I made up DD's bed for her (got me out of dragging stuff up loads of stairs) because I knew she was keen to go off and socialise and if she came back tipsy, at least her bed would be ready.
It's nice thinking back to 2017. I hope your DC have as good a time as she has had. She has just come back from a conference in Switzerland where she gave a presentation - still managed to fit in a paraglide in the Alps! I'm taking DD2 back to her uni tomorrow for her Masters year, so a long day behind the wheel for me. Her uni had slots but as we had to go around Birmingham, so almost missed it, they were very nice and understanding.