This is a job application for my English homework. Can you please correct my mistakes?

Dear Ms Richards,
I am writing to apply for the post of festival staff that I was sent by my assistant.
I have completed a degree in Event Management at the Aconcagua University in Mendoza. I have an upper-intermediate level of English, Italian and French (B2 on the CEFR). Consequently, I will be able to communicate with most foreign members of the public in order to help them enjoy the shows.
As you will see from my CV, I have some relevant experience because I’ve worked in the organization of numerous famous events such as Lollapalooza and Tomorrowland. My tasks have included ensuring safety and preventing unauthorized access to the site by members of the public.
I am very passionate about music and festivals and would welcome the chance to be part of such a top-notch company. I believe I would be suitable for the job due to my remarkable experience. I consider that I will be able to manage the situation and work...