1.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Update the session form to replace the single coach text input with a multi-select dropdown that pulls from users where `type-coach = 1`. Fetch coach data from the database and populate the dropdown options.
2.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Integrate Google Places Autocomplete for the location input field.
3.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Implement the logic to check if the selected Google Place ID exists in the `locations` table. If it exists, use the existing ID; otherwise, create a new entry in the `locations` table and use the new ID.
4.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Implement form submission.
5.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Before form submission, retrieve the array of selected coach IDs.
6.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: On form submission, use JavaScript to send a POST request to `/api/sessions/validate.php` with the array of coach IDs.
7.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Process the response from `/api/sessions/validate.php`.
8.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: If the API returns warnings, display a modal listing all conflicts (Venue, Personnel, and Travel).
9.  Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Add an "Override" button to the modal.
10. Modify `/mnt/ssd_data/html/early_access/coachs-site.php`: Implement the override functionality. If the user clicks the "Override" button, submit the form.