E.g. I would like on the detail event listing page to have the words “Event Details” and move the actual event title underneath the image carousel (action example?)

Another (filter?) example is removing the event image form the map bubble (.geodir-bubble_image .geodir_thumbnail – setting this to display: none !impoortant; doesn’t seem to work)

.geodir-bubble_image .geodir_thumbnail
{display:none !important;}

in your sample you had two “o” in !important

About the title in the detail, I’m sure I have written a function here in the forum, I will search it and let you know

.geodir-bubble_image {
	display: none !important;
}

I think the other issue has something to do with geodir_action_before_single_post.

edit: this might be it: https://wpgeodirectory.com/support/topic/move-slider-gallery/

remove_action( 'geodir_details_main_content', 'geodir_action_page_title',20);
add_action( 'geodir_details_main_content', 'geodir_action_page_title',35);

$current_posttype = geodir_get_current_posttype();
if ($current_posttype =="gd_event") {
echo "bla";
} 

<article itemtype="http://schema.org/LocalBusiness" itemscope="" class="post-76 gd_event type-gd_event status-publish has-post-thumbnail hentry gd_event_tags-museum-1 gd_event_tags-star-wars gd_eventcategory-museum" id="post-76">
    <h2>Event Details</h2>
            <div class="geodir_flex-container">

So

<h2>Event Details</h2>

is inserted before the flexslider

add_action('geodir_before_single_post' , 'itson_geodir_before_single_post', 10);

function itson_geodir_before_single_post(){
?>

<h2>Event Details</h2>

<?php
}

from your post: https://wpgeodirectory.com/support/topic/share-buttons/#post-29165