This looks correct, the only thing I can see is that you have
'meta_query' => array(
'relation' => 'AND',
array(
'key' => 'start_date',
'compare' => '>=',
'value' => $today,
),
array(
'key' => 'end_date',
'compare' => '<=',
'value' => $today,
)
)
so only posts with today’s date in both the start and end date will appear. Maybe you’re not comparing it right. What do you want it to return?
