While this is not the way our theme is supposed to work, several clients use it that way. By using posting privileges that WordPress uses you could get users to register and then access the event posting area of the dashboard.
Once again we do not recommend to use Januas this way as there may be unexpected problems we did not cater for. You will probably need external plugins to make the site work the way you mentioned.
In essence, it’s feasible but we do not recommend it nor we will be able to help of anything goes wrong.