Event registration must be more flexible!
We need the following features and we see them as something that should be standard!

Possibility to:
- Prefill information on standard event registration (not only marketing form)
- Possibility to lock fields on event registration (to make sure invitation is private)
- Possibility to decide exactly how many additional attendees that can be brought to an event.
- Possibility to show different custom registration fields for different invited, so that some options are only visible to some attended. Not all invited should have the same options.

We tried to solve the last two using marketing forms and different content blocks that only some people could see, but then we're only able to have one custom registration field in a content block, no more will be created as registration responses. So then our idea with custom build with html & plugin will still not work properly to solve the case to only add one extra attendee and show different fields for different groups.