Events | Shepherd ISD

When specifying accessible names via `aria-labelledby`, ensure that the 
label elements exist.

## Explanation

Accessible names are required for many parts of a page, including form controls.
One way to accomplish this is to use `aria-labelledby` to specify the ID or IDs of 
other elements which contain a label. For example:

```html
<h2 id="dialog-labell">Important message!</h2>
<dialog aria-labelledby="dialog-label">
```

In this example, the `aria-labelledby` for the `<dialog>` points to an ID of `dialog-label`,
which doesn't exist. The heading it refers to instead has an ID of `dialog-labell`, presumably 
a typo.

## Why this matters

It isn't usually clear when an accessible name is broken, even during user testing.

This check helps to identify where an element clearly intended to have a label, but
that label is missing.

When a label is broken, it may be impossible for a user of assistive technologies
to understand what that element does.

Title / URL	Issues
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28774733	2
Events \| Shepherd ISDwww.shepherdisd.net/events	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=29410125	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28774912	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28774735	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28774736	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28774734	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=28771623	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=29409777	2
Events \| Shepherd ISDwww.shepherdisd.net/events?id=29410537	2

Fix missing ARIA label IDs

Shepherd ISD

Where this issue has occurred