
I have posted links to the poster for the Princes Hall concert below. There are three versions, all deliverable as PDFs:
A4 portrait
A5 portrait
2 x A5, side-by-side on A4 landscape
Only use the A5 portarit poster if you happen to have A5 paper! The A5 poster is most useful as a hand bill; if you plan to get posters put on display, push for the A4 version!
When you print the posters, in the Print dialog under Page Handling, make sure Page Scaling is set to None (your default might be Fit to Printable Area or Shrink to Printable Area); this way the poster will print at the correct scale and look correctly proportioned on the page. You should not get any margin problems with edges not printing (particularly the ellipse).