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In case you work at or partner with a company that uses Apache Airflow and supports contributing to Open-Source, it's very easy to get such company to sponsor such event: host the event inn a suitable event space, sponsor food and drinks. Workshops like that are perfect recruitment event for such companies. They can show that they are open-source-friendly company that cares about people learning new stuff, that they are happy to host people, they can bring their own employees who will also be happy to participate in the event and build relationship with the participants. As an example - the first Apache Airflow Workshop in Berlin was sponsored by Google Cloud, Polidea and Contentful. The second one in Warsaw was sponsored by Polidea.
Sponsoring companies - when they host such - event usually have people who also take care about ordering food/drinks, setting up the event space, making sure the network works, providing WiFi access to guests and even welcoming the people when they come - this is an important. Some companies will also help with preparing SWAGS (at Promo stuff you can download all the materials to prepare such promo stuff as mugs, stickers, hoodies etc.).
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