1
Short answer is: Big Meta Queries are incredibly bad and can quickly lead to the MySQL-Server not responding anymore. You should try to rework the meta_query to not have so many clauses.
Long Answer:
Wordpress Post Metadata is stored incredibly inefficient when it comes to querying. Best advise would be to never ever EVER store data that you would need to ...
1
I found an answer to my own question:
If I use the tax_query arg then I could specify 'operator' => 'NOT IN' like so:
$events = tribe_get_events([
'tax_query' => array(
array(
'taxonomy' => 'post_tag',
'field' => 'name',
'terms' => $current_tag,
'operator' => 'NOT IN' // ...
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