Example looping through an 'event' post type, and then an acf repeater 'event_repeater' inside each event

array.php

<?php

function my_get_calendar_events() {

    // Custom post type slug
    $post_type = 'event';

    // ACF field names (post-level)
    $field_color      = 'event_color'; 
    $field_start      = 'event_start_date';
    $field_end        = 'event_end_date';

    // Repeater field name
    $repeater_field   = 'event_repeater'; 

    // Repeater sub-fields
    $repeater_start   = 'event_repeater_start_date';
    $repeater_end     = 'event_repeater_end_date'; 

	

    $events = array();

    $posts = get_posts( array(
        'post_type'      => $post_type,
        'posts_per_page' => -1,
        'post_status'    => 'publish',
    ) );

    // Loop through posts
    foreach ( $posts as $post ) {
        $title = get_the_title( $post->ID );
        $url   = get_permalink( $post->ID );
        $color = get_field( $field_color, $post->ID );

        // Event data from posts
        $start = get_field( $field_start, $post->ID );
        if ( $start ) {
            $events[] = array(
                'id'    => $post->ID,
                'title' => $title,
                'start' => $start,
                'end'   => get_field( $field_end, $post->ID ) ?: '',
                'color' => $color ?: '',
                'url'   => $url,
            );
        }

        // Repeater events
        $rows = get_field( $repeater_field, $post->ID );
        if ( $rows ) {
            foreach ( $rows as $index => $row ) {

                if ( empty( $row[ $repeater_start ] ) ) {
                    continue;
                }

				// Event data from repeater
                $events[] = array(
                    'id'    => $post->ID . '_' . $index,
                    'title' => $title,
                    'start' => $row[ $repeater_start ],
                    'end'   => $row[ $repeater_end ] ?: '',
                    'color' => $color ?: '',
                    'url'   => $url,
                );
            }
        }
    }

    return $events;
}

// Whitelist for {echo:} dynamic tag.
add_filter( 'bricks/code/echo_function_names', function( $names ) {
    $names[] = 'my_get_calendar_events';
    return $names;
} );

Now it'll be looping through all the posts and the repeater wthin each post, producing the array of events, something like this..

[
{
"id": 15069,
"title": "Art Exhibition",
"start": "2026-05-07",
"end": "2026-05-07 01:00:00",
"color": "#3788d8",
"url": "https://some-website.com"
},
{
"id": 15069,
"title": "Art Exhibition",
"start": "2026-05-12",
"end": "2026-05-15",
"color": "#3788d8",
"url": "https://some-website.com"
},
{
"id": 15069,
"title": "Art Exhibition",
"start": "2026-05-29",
"end": "2026-05-31",
"color": "#3788d8",
"url": "https://some-website.com"
},
{
"id": 15069,
"title": "Business Networking",
"start": "2026-04-13",
"end": "2026-04-13 01:00:00",
"color": "#3788d8",
"url": "https://some-different-website.com"
},
]

Use Bricks' echo function to add the array to the query loop

Then you'd grab the values from each item in the loop using Bricks' query_array dynamic tag

{query_array @key:'title'}
{query_array @key:'start'}
{query_array @key:'color'}

See Bricks' docs for more examples of how to get data from array - https://academy.bricksbuilder.io/article/query-loop/