Here are some tips that will make your job easier, and help the meeting go more smoothly.
Some people check one or the other more frequently, so sending both is really valuable.
Include in your message who is scheduled to do which roles, and remind everyone that it is their responsibility to fill the role, or find a replacement. These will be the toughest roles to get replacements for, and often, those scheduled will not remember that they are signed up for the role. Get information from your speakers. Make an agenda. We have showcase templates that make preparing an agenda really quick and easy.