This is where you will be. The meeting will be at Jordan Engineers Association. The meeting is in 3 weeks.

If you visit a city, town or country, it's always "in." "I was in Ireland for two weeks." "My family was in Paris during their vaction." "My friend is in South Africa at the moment." When referring to a particular place like an airport, department of motor vehicles, courthouse or library, "AT" is usually used. "I was at the airport for three hours." "The wait at the motor vehicle department was too long." "I was at the courthouse signing documents." It should be noted you can be "IN" an airport, but this is saying INSIDE OF. So, "My car was towed in the airport" makes no sense and is NOT correct because this is saying your car was inside the actual terminal/building, ect. "My car was towed at the airport" is correct. So, regarding your question, "I was at the Jordan Engineers Association for two hours," is correct. "I was in one of the offices at the Jordan Engineers Association for two hours," works also.

You could say: For the past 12 hours I have been at Jordan Engineers Association IN the conference room. OR Yesterday I was at Jordan Engineers Association for 12 hours. Your way works just fine these are just examples. Yes - at

Both ok

Most time they choose at