Checkout question

Would it be possible to add a question as part of the registration process? A simple question similar to how we can do elsewhere like Where did you learn about this event? or Which session drew you here? And then a drop down option for them to select through? The drop down could include things like the speaker names, talk titles, or friend/flyer/etc.options we can type in ourselves. I know we have the affiliate links tracking when they’re used, I just would be interested because if I put up physical flyers, for example, with just my main link, I’d love to see the impact they have too.I also may post at places like libraries and, if the flyer has a good impact, make a donation there vs needing to contact and set up an affiliate link for them.