1. Create a folder in your Google Drive and create a sharing link with edit permissions.
2. Share this link with people on the event (e.g. print a QR code)
3. Everyone can take a photo on their own phone and upload it to the shared folder.
4. The script downloads photos from the shared folder and shows them in a slideshow in random order.
5. It keeps checking the folder and when a new picture is uploaded to the shared folder, it's downloaded locally and shown for 20 seconds. Then the slideshow continues.

Uploading photos directly to the shared Google Drive folder has the following drawbacks:

• By default, uploading to Google Drive may be restricted to WiFi connection. When people have just mobile internet, they have to force the upload.
• Anyone can remove any photo in the shared folder.

You can create a Google Form with just a single "File upload" question. You can restrict the file type to "Images". There's a "View folder" link in the form editor which redirects you to the Google Drive folder which id you need to set to the folder_id variable in the photo_corner.py script.

This way, users can only upload their photos and it works well also on a mobile internet.

1. Install python libs: pip install google-api-python-client google-auth-httplib2 google-auth-oauthlib pillow schedule
2. Edit the script and change the folder_id = 'YOUR_GOOGLE_DRIVE_FOLDER_ID'
3. Log into your Google Cloud console, create a service with OAuth and download the credentials json into credentials.json