Bobblue
Hi
The value should be
COM_COMMUNITY_EMAIL_EVENT_GROUP_INVITE_NO_MSG="Hi {target},\n\n{actor} has invited you to join an event %1$s.\n\nEvent Description: %2$s,\n\nTo view the event, access the URL at the following location:\n\n<a href=_QQQ_{url}_QQQ_>{url}</a>\n\nHave a nice day!"
The description of event will be short description, i tested it on fresh installation and there is no issue.
Regards