The UKUUG Spring 2009 Conference (24-26 March 2009 in London) has a strong LDAP flavour.
OpenLDAP and other LDAP technologies are covered by several papers:
* OpenLDAP Replication Strategies Gavin Henry (Suretec Systems & OpenLDAP project)
* OpenLDAP and MySQL: Bridging the Data Model Divide Howard Chu (Symas Corp. & OpenLDAP project)
* Writing Access Control Policies for LDAP Andrew Findlay (Skills 1st)
* Securing Access to UNIX, Linux and Mac with Active Directory Barry Scott (Centrify)
There is also a Kerberos tutorial and several papers on systems monitoring.
The programme is here: http://www.ukuug.org/events/spring2009/programme/
Andrew