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Hi Michael,
It is great to hear from you. I m writing this e-mail to you because I have the pleasure of inviting you for the yearly feast - Halloween which is held on Monday, 31st of October and starts at 6 p.m in my school.
I would like you to come because it will be a great opportunity to meet my friends and spend good time.
Last year the main part of the event will be a awesome concert given by "Nightmare". This is the famous school band. Students and teachers had a great time to their music.
On this opportunity headteacher organize school trip to haunted house*! Would you like to go with me?
Write back soon.
XYZ

* haunted house - nie wiem czy to dobre slowo chodzilo mi o atrakcje turystyczna, dom strachow

Z gory dziekuje! :)

przecinek przed which
przedimek przed good time,
Last year the main part of the event will be W ZESZŁYM ROKU BĘDZIE? a ZŁY PRZEDIMEK awesome concert given by "Nightmare". This is the JEDYNA? famous school band. PRZEDIMEK Students and teachers had a great time to their music. On this opportunity NIEZROZUMIAŁE WYRAŻENIE +PRZEDIMEK headteacher organize NIEGRAMATYCZNE +PRZEDIMEKschool trip to PRZEDIMEK haunted house*! Would you like to go with me?

inviting you for the yearly feast podejrzewam że nie miało być feast.

Dziekuje Ci, juz poprawiam! :) Dopiero teraz zauwazylam jakie niektore bledy glupie popelnilam. Jeszcze raz dziekuje za wskazanie. :)