To create a lot more promotion, event attendance, and stakeholder engagement, you should consider creating a large set of promotional videos - each video featuring a different vendor, presenter, performer, cause, promotional partner, and sponsor.
Each of them will share their enthusiasm about participating in event, why they’re participating (what outcome is getting created that they want?), and what attendees will receive by stopping by their booth or attending their presentation at the event (e.g., samples; get to know us; substantial discount; some experience; etc.).
Each of their responses should be cut down to a 30-90 second clip that is added to the 30-60 second primary promotional video. For some of them that provide a more in depth response, it may be useful to create a longer video that they can share separately for those interested in more details.
Each of these videos will prominently feature sponsor logos, as this will likely be your most effective pre-event sponsor vehicle - showcasing sponsors to the networks of each of the stakeholders across each of their social media channels.
This will have the net effect of helping sponsors reach many more prospects than will attend the event by giving them direct access to dozens of social media channels of all the participating stakeholders.
If desired, Uniting for Action can manage all aspects of this from creating the primary promotional video, to creating or collecting the videos from stakeholders, and editing them into custom co-branded videos with all the event branding, sponsor features, etc.