Changing Currency

yes, please see Settings > Bookings > Pricing Options > Currency

http://wp-events-plugin.com/documentation/

you can try this snippet in your theme functions.php

function my_em_add_currencies($currencies){
	$currencies->names['RUB'] = 'RUB - Russian Roubles';
	$currencies->symbols['RUB'] = 'RUB';
	$currencies->true_symbols['RUB'] = 'RUB';
	return $currencies;
}
add_filter('em_get_currencies','my_em_add_currencies');