/Hi Mary
I'm writing to invite you/ to a meeting here on 14 May. /I've arranged it to bring together all our colleagues working in Central Europe to/ share experiences about working in this market. /It'd be great to see you.
The meeting will last all day and will have an informal agenda - you won't need to/ write a report for it or make a presentation. /There'll be plenty to eat and drink during the day.
Hope to see you in May!/. Please let me know if you /can make it, asap/.
Best regards,
/Stephanie


Thanks a lot for the invitation/. /I'd love to come to the meeting. It sounds like a great idea/. Please let me know if there's anything I can do to help from this end.
Will it be okay/ to bring Marina Rutka as well? She's a new member of our team and is very involved with the Central Europe market. Thanks again/, and /see you on 14 May.

Thanks a lot for the invite/. Unfortunately, I have another appointment on that day. I'm very sorry that I will miss the meeting/.
In any case, send my regards to everyone at the meeting, and please /email me and let me know how it went.
I hope we can meet up soon/.
Good luck with the meeting!/.