*Capitalize May.

*Either say “the Fifteenth of May” or “May 15, 2007,” but do not at the “th” to the date.

*Spell-check “approaches.”

*Your original has an unclear antecedent. Is the current seminar “Approaches….” or were the previous seminars entitled “Approaches….”? Making the sentence formal and correct will depend on the answer.

* More than one “formal and correct” phrasing is possible. How to phrase the sentence depends on what point you want to make. Is your point that the seminars were May 15? Then put that first. If the point is that ORA held the seminars, then put that first.

— The May 15, 2007 ORA seminar entitled “Approaches to….” was about the previous economic seminars.

— ORA held a seminar entitled “Approaches to…” on May 15, 2007, about previous economic seminars. (Emphasis now on who, not when)

— ORA held a seminar on May 15, 2007 about previous economic seminars entitled “Approaches to….”

If you can read it out loud without stumbling, it is probably going to be okay. If someone else can cold read it and then explain it to you accurately, it is reasonably well written.

-MM

comma after 2007

make more clear if the May 15 seminar is called “Approaches to…” or if the previous seminars have this title

also approches is written approaches.

other than that i think it is quite ok.