I can completely understand your apprehension. I can also see how it is quite a complement in knowing how valuable you are to the team and to them in helping to make this a success for this extension of the company or its services/product.

In having similar dx and having to travel once for work, I tried to think of it as an adventure and in how I was going to help. It usually means the world to have someone from the company come face to face from the company and is so very helpful, that I try to focus on how I can be of help with what I know about the product or service, as this is what they want, instead of how well I might/not perform. We are not all marketing people but we each have our skill sets that our valuable and can share these. Be yourself and share what you know about the company/product. It is the information that is most important. You know that part about the companyand its product(s) and really can do it, that is all you need to share, with a lot of deep breathing. No worries!!!

I have traveled there before so if you you want to talk about it, please feel free to PM me. Wishing you all the best!