When to use reflexive with Passer

Leslie, 

Two links below to the relevant lessons here. 

As an alternative discussion is often helpful, the last link is to the Laura Lawless site, covering the same issues  

Passer can be used with avoir or être in compound tenses depending on its meaning in French (Le Passé Composé)

  Passer/se passer/se passer de - the different meanings of the verb "passer" in French

 https://www.lawlessfrench.com/grammar/passer-lesson/