If you miss the seminar assignment deadline, there is a folder in Bilda called "Late assignments" where you can drop it.
If you have dropped an assignment there (for example your Pecha Kucha presentation) which has then been graded, the system does (apparently) not allow you to drop another assignment there. For this reason, there is now a new folder called "Later assignments" where you can drop things off.
Do note that you can always upload an assignment and later replace it with a new version as long as 1) the deadline has not been passed and 2) the assignment has not been graded.
For these and other reasons we will not grade "late assignments" or "later assignments" until later, when the course finishes. You can drop late assignments in any of the two folders.