In mid-June Rachel told me she was going camping with a friend since they were both on school holidays.
Rachel tweeted her excitement about going camping with her friend.
On the 15th of July, 2009, I saw a tweet from her friend that responded to Rachel's tweet in confusion.

Then, I started to put some other occurrences together and thought that the dinner I was going to have and Pancakes On The Rocks with my mom and sister would actually be a surprise that Rachel had flown all the way to Australia to see me.
Thanks to the tweeting and a few other events I was correct.
This is the video of Rachel arriving at POTR.