THE celebrated critic and semiotician, Jacques Derrida, who is a pioneer of that critical practice known as "deconstruction" - (it is probably known as a few other things by harassed English literature students) - gives a lecture tonight in Lecture Theatre L, Arts Building, UCD, at 7 p.m, called "History Of The Lie, Lie Of The State ... Sculptor Janet Mullarney gives a talk about her work today at Temple Bar Gallery at 1.15 p.m. ... The Mandies, a new line up of the Tallafornia Mandolin Band, play Mondays at 9.30 p.m. at Slattery's, Capel Street ... Ceol Cois Locha, a new series of 10 programmes of traditional music recorded at the Lakeside Centre in Dunlewey, Co Donegal, goes out at 8 p.m. on Teilifis na Gaeilge on Wednesday next.