Cameron,
I just read the exhibitor prospectus that NASO put out for this event.
NON-ENDORSEMENT
The exposition of products and services at The Sports Officiating Summit does not constitute an endorsement by NASO of any product or service exhibited. An Exhibitor is not permitted to represent in any manner that NASO has endorsed its goods or services.
ACCEPTANCE OF APPLICATION
Applications for exhibit space are subject to review by NASO to decide suitability for the Summit and to ensure conformity with Summit standards. NASO reserves the right to cancel or refuse rental of space to any person or company whose conduct or display of goods is incompatible with the general character and objectives of the Summit. Only those companies with a product or service directly related to sports officiating will be allowed to exhibit.
While this provides lots of wriggle room for NASO, I would use this language in my favor. Clearly, your product conforms to the compatibility, character and objectives of the summit. Since NASO does not endorse any exhibitor, I would bypass the sales rep for the convention manager or the executive director of NASO and be quite pushy.
My experience with trade shows (and I have a lot) is that all exhibitors are welcome. The favored companies get better position and often other "perks" -- which they usually pay for. If you really want to be here, I think you should try harder. If you need help, send me a private message.