Can non members book on Event without logging in

I want to be able to offer tickets to members & non members. I've worked our how to that with the prices....

But if a non member books they are asked to log in...

Also... I want members to be able to buy a ticket for themselves and another for a guest (i.e. one at member price, one at non member price.) At the moment if you are logged in it just gives you the opportunity to but more than one ticket at members price.

Any help appreciated.