Improve Createfixtures Command

At this point, the Createfixtures command does not work optimal.

For instance:

-When you try to create random events, most of the time, those events are in the past.

-We you try to create a committee, you need at least 20 users, so it does not do anything.

Expected behaviour:

Being able to use the createfixtures command without any trouble, so that everything works quick and flawless.