Roy E. Disney is scheduled to make a rare keynote speech May 18 at the annual meeting of the Large-Format Cinema Assn.Disney, vice chairman of the Walt Disney Co., is expected to address the commercial potential of large-format pics. He’ll also discuss how large-format theaters can be integrated into larger entertainment schemes. The topic is especially relevant to Disney as “Fantasia 2000” completes a successful four-month engagement. Its cume is $46 million from just 54 theaters. Feature toon will be relaunched in standard 35mm format this summer. The LFCA confab runs May 17-20 in L.A. Disney’s speech will be at the California Science Center, which has an Imax theater. Only association members may attend.