Printed materials are still a thing! Creating an ad in your local weekly may bring more people to your event than anything else. Passing out postcards or posting flyers at other events similar to yours are a great way to spread the word.
Designing apparel, promotional items and packaging requires the same skills as creating traditional print media, except that you must consider the design in three dimensions. Fortunately this can be accomplished with mock ups and experimentation. Clothing is a great way to create memorabilia and to share your brand.
Be careful to consider the environment before printing or creating “swag” . Consider migrating information from brochures online or into apps.