Illuminati [Outdoor]

You actually wanted to book an escape room together, but on site you notice a mysterious and abandoned bag. You look around and ask on the spot if it belongs to someone, when the answer is no, you open it in the hope of being able to identify the owner. Apart from some utensils, a letter and a tablet you can't find anything in the bag that indicates the owner. You decide to read the letter to find clues... From this point your adventure begins.