Hi english_learn. Below are some suggestions for you. I have marked suggested deletions with strike-through text, and I have marked suggested insertions with bold, blue text. I have added a few notes in parentheses; those notes should be addressed and then deleted.
I'm from the US so I'll edit that way. You can use the date style you have as well though if you're writing for another country (although check Oxford for proper expression of dates because I don't remember off the top of my head if superscripts are used--I'm guessing they are not).
For your reference, my suggestions are based in Chicago style (and Merriam-Webster Collegiate for spelling).
The Project Planning approval meeting is on
15th of SeptemberSeptember 15. If you have any requests, completed forms are due to our mail boxmailbox by 2.00pm2:00 p.m. on Wednesday the 22ndAugust 22.
Please use the new template, which can be found on our website, and ensure that the forms are completed in full. If you have any questions or need help, please contact us via
Purposepurpose of this meeting is to review the planning process and understand the potential risks (Note: This idea would sound more complete if you said "risks of X."). Having the developers and testers in this meeting will add more value, . Soso please tell me whomwho I want to forwardI should send/you would like me to send (Note: choose one) the meeting invite to. MyI am working on a 30-million-dollar project in the area of service transition. (Note: This idea could probably benefit from a transition. It's not clear if this is a purpose or a topic that will be discussed or something else. Perhaps it is clear to your workers but it would be good form, in my opinion, to lead into this item with some kind of transition to identify the item.)