Hey Franky, not sure if this is possible at the moment if not then I would like to have this as a feature request.
Here is my story, my company is attending this huge 4 days event to meet up with potential prospects and we are using your plugin to let them schedule a meeting with us before the event starts.
Now the event started but since we are still gonna be there for 4 whole days of the event I would like to keep the RSVP open until the end of the event so that even during the event they can still use the form to schedule a meeting with us.
Currently the plugin only allows me to have "RSVP 0 days before the event starts." so it would be great to see if I can set it until the end of the event option.
Much appreciated Franky.