You can create a QR code that links to a Google Form for other users' ease of access. Here's how to get started and link the two together.

4. A pop-up will appear asking you to create a free account, but you don't have to create an account. Just wait for the QR code to finish generating and it will appear in your downloads as an image.

If you want to be lazy, you can pick a simpler template, not bother with the logo or graphic, and just put in the QR code and enough details to identify the event. That takes about a minute.