To have archive pages exist for venues and organizers in Modern Tribe's The Events Calendar plugin.

functions.php

<?php
// Insert this into your functions.php file:

add_filter( 'tribe_events_register_venue_type_args', 'my_modification_of_post_type_args', 10, 1 );
add_filter( 'tribe_events_register_organizer_type_args', 'my_modification_of_post_type_args', 10, 1 );

function my_modification_of_post_type_args( $args ) {
	$args['has_archive'] = true;
 	// You could also assign a string to has_archive, which would be the archive slug:
  	// $args['has_archive'] = 'venues';
  	// Obviously then you need to break this into two functions, one for venues and one for organizers,
  	// that hook into their respective hooks, above.
	return $args;
}

Paul, how did you manage to load the archive template. I've tried placing archive-venue.php in about every location I can think of without any luck.