No, no, no soiling the nest. They were just too busy with other stuff - graduation stuff, winding down with school stuff, shopping, plans, other EC stuff, getting their medical, dental appointments, pictures with friends, meeting all the teachers they loved ...
My two kids did not want a graduation party (they were attending many themselves) but they wanted money to do different activities and trips with different groups of friends - and that continued for weeks. We planned international vacations for a week as a graduation present, and we did that with them as a family.
My kids also went to state unis around 30 minutes away - so it was not like it was very heartbreaking. They were dropping in and out of the house for all the 4 years of college.
My kids are out of college now. Working, one is even married. They still come and go from my house even if we are travelling and not available. Their room looks exactly the same as it was in HS. I am ok with all of this.