MN cleans up and opens your pores. I think it is a really bad idea to relax with your scalp in that condition. Wash your hair, do a nice long moisturizing conditioner under the dryer with a plastic cap to loosen up your new growth, then relax in seven days.
If the MN has created a problem for your scalp, you will burn and your hair will potentially fall out. DO NOT TAKE THAT RISK!