It is certainly eye catching, but I think the Perpetua could be prone to bleeding, as it is so delicate and in a small point size. I think I may shift the design around a little using helvetica.
Lowercase examples. I matched the 160 tracking used in the publication, and took away '2013' as it should be obvious what year it is, and it split the line to make the layout inconsistent. I aim to highlight this somewhere else anyway.
With the invite text on. I reverted the 'admission free' back up where it was as although it lined up with the left column better, it had one more line which looked too close to the bottom of the page. I have included '2013' but it looks a little odd at the moment as it cuts into the left column.
White on Magenta
Magenta on White
Overall, having stuck to the aesthetics of the final page, it is consistent with the design. I like the idea of implementing magenta as it responds to the front page. The magenta background will stand out and the debossed impression gives a high-end feel to the print - more than the run of the mill printed invite.