CREATE TABLE table_name_8 (playoffs VARCHAR(255), year VARCHAR(255), league VARCHAR(255), open_cup VARCHAR(255))
NAME THE Playoffs that HAVE a League of npsl, and a Open Cup of did not enter, and a Year of 2013?
    
SQL: SELECT playoffs FROM table_name_8 WHERE league = "npsl" AND open_cup = "did not enter" AND year = "2013"