Will I be able to join about half an hour late?
If you are late for a Naughty Paws event by more than a few minutes then I cannot guarantee you a spot. You can always check to see if there are spots available when you are available but if you want to guarantee yourself a spot then you should sign into the PlayStation Network around the time of the event (i.e., get ready to participate in the event) and join the text chat that is usually set up for everyone.
PlayStation Consumer Services and Technical Support: 1-800-345-7669
PlayStation Account and Billing Support: 1-877-971-7669