https://www.cnet.com/news/best-party-planning-apps-for-hosting-a-kentucky-derby-party-in-2019/

Use Evite (download for iOS or Android) to invite your guests with a personalized Kentucky Derby invitation. Use the templates provided in-app or design your own. Add the event name, time and location. And the send invitations via text or email.

Let your guests know what type of event you're having, like formal indoor seating or a relaxed outdoor get together. Create polls to collect ideas for Derby games and food.