1- I remember last year, one of my best friends was graduating from university and I was supposed to throw a surprise graduation party for her at her [own] place.
2- The only person [being] aware of this was her mother.
3- I was suddenly aroused (roused/woken/awoken) by her mom's call.
Aroused means to be made excited in some way, when already awake.
Student or Learner