Will you make posters? Post to social media? Create an event or Instagram feed?
What supplies do you need for your activity? Are you creating something?
Are you making a presentation for your pitch and/or final activity? Do you need permission to show a movie, or play a song? Do you have access to the right equipment?
Are you creating something for your activity? Making a product to sell or showcase during your pitch (prototype?)
Draw it out!
Sketches, designs, posters, etc. Create some rough ideas to help you plan.