ADD DATE occurs in the 5th week of the term; see the Academic Calendar for exact dates. If you missed the deadline to add a subject you will need to petition CAP. See Petition Process for detailed instructions.
CAP's guiding principle is that students should receive appropriate credit for work done, in the term in which the work was done. Late Add petitions must clearly document when you began attending class and submitting work in a subject (was it before Add Date?). Your instructor should confirm your statement.
Late Add of a UROP
Note that UROP for credit (and other variable-unit subjects) may be added up until DROP DATE (during the first 10 weeks of the term; see the Academic Calendar for exact dates). You may register a UROP for credit even before your UROP proposal has been approved. See the UROP website for full instructions.
If you miss this deadline, you may petition CAP to Late Add a UROP for credit, but because the deadline is so late in the term, the Committee is less likely to approve such a petition.