Last week I joined a survey from Bankless and I was awarded a POAP, a nifty badge, that I have attended the survey.
It is stored on xDAI and I was unable to manage to get it over to the mainnet, however, with the current gas price it might be a blessing
I think we could adapt this marketing strategy and award attendance to certain events. I read it can be also used with QR codes. We could place such QR codes at our presentations and so add additional exposure to the world.
POAP can be found at https://poap.xyz