Yes. This is correct. That does not mean it is the clearest way to say it. You might say this: " I was invited to present the project at the Word Congress. This was quite an honor. (optional) This is the most important world event related to transports. Sometimes splitting a sentence helps deep things paced and clear. - A style choice to consider.

Correct but the wording is convoluted and not how native speakers would say or write. Here's one version, I was asked to present a project at the World Congress; an international event related to transportation. From the more information you had given in your comments. I was asked by those in charge of the project to represent them at the World Congress on transportation; an international event.