You have the choice of presenting an art installation, online or Zoom presentation, poster presentation, reading or performance, or table presentation. Read more here: https://www.niagaracc.suny.edu/categories/ .
You can learn more about what each type of presentation requires:
All entries require a poster or slide, regardless of category. Find instructions to make posters of different sizes:
The video Creating a Poster for Student Showcase @ NCCC gives advice specific for the Student Showcase on creating a poster from a PowerPoint slide. A transcript is also available at https://youtu.be/mfV_p-vgL_k .