I just asked the team and it looks like there won't be anyone at SF3 from the actifit team. But you could join their discord-channel to ask all questions you have! Here you go: https://discord.gg/GubSAFg

You might also want to talk to some top actifit-delegators at SF3 like @flauwy, who will be definitely at the SF.

You can find a full list of delegators at https://actifit.io/
Maybe there are more attending SF, but I don't know.

(alias @actifit-peter)