Dear Felix
I would like to invite you to a seminar that I’m confident will interest you.
The [NAME OF SEMINAR, ex. 3D Technologies Seminar] held at [PLACE, ex. the Toronto Sky Dome] on [DATE, ex. June 13] will [DESCRIBE TOPIC AND FEATURES OF SEMINAR, ex. feature lectures by several key programmers and designers in the field of 3D modeling, with topics including tri linear filtering, anti-aliasing and mipmapping].
I am enclosing [X] tickets for you. I hope that you decide to attend and I am looking forward to seeing you there.
Regards
Lydia