changing header image using a hook

Hi, i would like to change the header image which appears in one of my plugins inner pages.currently it uses the default image. im using a query to determine a certian condition and then id'e like to change it. in my child theme i created a function that hooks to the "catchevolution_after_header" trigger. what function can i use to the change the header image at this stage? is it "set_post_thumbnail()" or something else ? thanks

function change_tribe_events_head() {
 
	if ( tribe_is_event_query() ) {
	   //change header image here
	} 	
}
 
add_action( 'catchevolution_after_header', 'change_tribe_events_head');