Contact Form 7 Dynamic Text Extension – how to send data fro meta boxes

Hi everyone,

i’m building this site where you can pick an event from a calendar (made with meta boxes) i want to send this info when visitors click on the read more link and from that page to the contactform.

any way to manage that?
this is the code i’m using on hte first page:

<?php echo get_post_meta($post->ID, 'ecpt_datumyoga', true); ?>
<?php echo get_post_meta($post->ID, 'ecpt_onderwerpyoga', true); ?>
<a href="<?php the_permalink(); ?>">read more</a>

to this page from where i send everything to the contactform

<?php echo get_post_meta($post->ID, 'ecpt_referentieyoga', true); ?>
<?php echo get_post_meta($post->ID, 'ecpt_datumyoga', true); ?>
<?php echo get_post_meta($post->ID, 'ecpt_tijdstipyoga', true); ?>
<?php echo get_post_meta($post->ID, 'ecpt_maxaantaldeelnemersyoga', true); ?>
<a href="<!--this goes to the contactform-->">Subscribe</a>

any ideas or solutions how to fix this?

thanks !!