Hi Hayley Lundall,
1. yes anyone can attend the Open day
2. I think you should wear suit with skirt and closed shoes with heels. Hair should be styled away from the face .
3. I think you should wear your clear/natural contact lenses
4. Nails must be well manicured and polished. I have a french manicure, so I think that is not a problem
5. At the open day, it doesn't matter. For the finalnal interview they will ask you to bring a professional photo
6. Smile, smile, smile and smile
and make friends, and be natural. Listen to the others and tell your opinion. Just be yourself.
ALL THE BEST!!!!