In addition to the online conference, Apple will host a special day for developers and students at Apple Park on June 6 to watch the keynote and State of the Union videos together, along with the online community. Space will be limited, and details about how to apply to attend will be provided on the Apple Developer site and app soon.
I give myself one thousand points for guessing the week and, no, I do not care that it was obvious.
Based on this phrasing, it seems like in-person attendees will watch the pre-recorded kickoff presentation and State of the Union video; do not expect a full in-person keynote. Maybe Tim Cook’s opening remarks will be delivered live, but that is the most I would assume, though I would be happy to be proved wrong.