Every Teamup Calendar has default event fields. These default fields can be configured in Settings > Event Fields. If you add custom fields to your Teamup Calendar, the custom fields will also be shown in this event field list where you can configure them as needed.
One way you can make your calendar more useful is by rearranging both default and custom fields. You might put them in order from most important to least, or put the most frequently used fields or required fields at the top, for example.
You can rearrange all fields except for the Title field and Calendar field.
How to rearrange event fields
Use the arrows to move a field up or down in the field order:
The event viewer and editor will reflect the changed field order immediately.
See also: How to configure default event fields, turn off event fields you don't want, make an event field required, rename an event field, enable signups and comments by default, and control the field contents shown in event titles.