Perlane is a hyaluronic acid product that is injected for filling and plumping. In cases where too much has been injected or it has been placed in the wrong area the material can be reduced with a product called Wydase which is hyaluronidase. This is an enzyme that breaks down hyaluronic acid and will decrease the amount of Restylane/Perlane. However, sometimes the best thing to do is to simply wait for the stuff (filler) to dissolve naturally. Restylane lasts 5-6 months and Perlane can last 8-9 months. In my opinion, more often than not its better to let it go away than possibly cause more inflammation with further injections. If the side effects you are experiencing are too severe to wait, you can consider the enzyme treatment. Given your event you might want to try the hyaluronidase treatment.
For future reference, I find Perlane to be too thick for treating the tear-trough area. You might want to consider using Restylane next time, and ask the doctor to inject TINY amounts. A little goes a long way.
I hope this info helps!