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Thank you, @LeonidS , but I did not find what I'm looking for in BxDolEmailTemplates.php file, __construct method, as you advised. Here an example from the "Event join request Template" what I am searching for:
{email_header}
<p>New request to join <a href="{EntryUrl}">{EntryTitle}</a> event from <a href="{NewMemberUrl}">{NewMemberDisplayName}</a></p>
{email_footer}
Is there a list of all substitute placeholders like {EntryUrl}, {EntryTitle}, etc.?