We encourage anyone who has a contribution to either of these theme topics to contact the relevant Theme Chair about participation in the special lecture sessions. We are also planning a special Algebraic Bull Session. If you are interested in contributing, please be prepared to describe your algebraic methodology, in ten minutes or less, as a prelude to open questions about where it fails to apply or give the quality of results that you would anticipate, or where you see challenges to its further development. Please attempt to bring the audience into the presentation by inviting discussion and eliciting input wherever appropriate. We want to make this a lively, dynamic forum for interaction. To assess interest, please let Van Henson know if you plan to contribute and/or attend the Bull Session.