Restrict blocks by post type. With example post type and blocks for post type only.

Blocks.php

<?php

add_filter( 'allowed_block_types_all', 'restrict_blocks_by_post_type', 10, 2 );

/**
 * Restrict blocks by post type.
 *
 * @param array|bool $allowed_block_types The allowed blocks.
 * @param WP_Post    $post                The post object.
 * @return array|bool
 *
 * @since WordPress 6.8.1
 */
public function restrict_blocks_by_post_type( $allowed_block_types, $block_editor_context ) {
	if ( empty( $block_editor_context->post ) ) {
		return $allowed_block_types;
	}

	// Get the post object.
	$post      = $block_editor_context->post;
	$post_type = $post->post_type;

	/*
		* Check if $allowed_block_types is a boolean true.
		* If it is, set it to an array of all registered blocks.
		*/
	if ( true === $allowed_block_types && ! is_array( $allowed_block_types ) ) {
		$allowed_block_types = array_keys( \WP_Block_Type_Registry::get_instance()->get_all_registered() );
	}

	// If we are _not_ in the Event post type, then remove unnecessary blocks from the editor.
	if ( EventPostType::get_instance()->name !== $post_type ) {
		$blocks_to_remove = [
			'aom/calendar-download',
			'aom/event-date',
			'aom/event-full-location',
		];

		// Remove the blocks from the allowed blocks.
		$allowed_block_types = array_diff( $allowed_block_types, $blocks_to_remove );
		$allowed_block_types = array_values( $allowed_block_types );
	}

	return $allowed_block_types;
}