Use this code to make all userID fields appear as dropdowns on the front-end for admin only. The userID field will still automatically insert the currently logged-in user's ID unless admin is filling out the form.

This example assumes you have two forms set up: one for the event and one for reservations. The event form will include a field for the number of available openings. The reservation form will include a Dynamic field to list all the events. This function will drop the number of available openings for an event when it is selected.