Can I get my registrants back!?

[emsybubs]

Hi there,

I am hosting a day long meeting and had it as registration only. I had gotten about 34 registrants already. We have someone entering the meeting as a surprise to receive an award, we were worried she would not be allowed to enter the "registration only" event and changed it to anyone can join at anytime. I did not realize that this would change it from a registration event and we would lose all those contacts! 

If I change it back to registration will those people still be there? Is there any way to get those participants back without them having to re-register!

Thank you!!