I suggest making sure the date and time is reasonable for people, making it stand out with pictures, and have a good title, and make sure it is well organized and it is an airport that people would be interested in.👍😀
As @AlphaSeven said here is my sum of it Patience is key young padawan… events take time to make, time to do ,and it requires time for people to sign up. I have an event posted I only have two signups in multiple days maybe a week. Patience here on the forum and in infinite flight should be your best friend. As my math teacher said you will never escape factoring in math. You will never escape patience in flying.
To answer your question, you must create a more detailed topic and/or have an interesting type of event. Creating a fly out into a more interesting or busy cities will probably contain more attendants. Or else have such event like destination hopping from one airport to another. Having a VA Sponsor your event is also something to increase your gate size. Some events also don’t have more attendants because there is no destination choice to choose in the gate list.
To create a more detailed topic, this is the topic I have first started looking to, and learned more afterwards.
Please compare a more detailed and yet simple event to your topic. Use the show preview to check for any mistakes you have created to your topic.
Here is example topic you might have to look when creating an event: