ESTA

Entertainment Services & Technology Association.

From the ESTA Website:
ESTA is a non-profit trade association representing the entertainment technology industry dedicated to a core mission of Building the Business of Show Business. ESTA promotes professionalism and growth in the industry and provides a forum where interested parties can come together to exchange ideas and information, create standards and recommended practices, and address issues of training and certification.

ESTA members supply a broad spectrum of products and services to the industry and range from large corporations to individual designers. Members include dealers, manufacturers, manufacturer's representatives, distributors, service and production companies, scenic houses, designers and consultants.