@
horsesp2 Thanks for clarifying. My generation had similar ideas when we were young, but we didn't use the word "manifest." There was still the idea of bringing something about through concentration of thought and energy. One book written back then called it Psychocybernetics.
I think having a positive mental attitude is very important, but I also think that ultimately, that attitude should compel us to action in order to bring about the things we want.
I am not sure what you mean by "there is nothing we can physically do", but for starters maybe you and your friend can make a list of things that would make the summer positive for you. Then see if there are things on that list you can take steps to make happen. To make them manifest.