Five College Number Theory Seminar - Meets regularly in Massachusetts. Programme, some abstracts. New York Joint Number Theory Seminar - Columbia -- CUNY -- NYU. Thursday evenings, starting 18 September 2003. Seminar on Higher Arithmetic - University of Nottingham, UK. First meeting: 6 December 2003. Sydney Computational Arithmetic Geometry Seminar - Sydney University. Normally meeting on Fridays during term. SERMON - SouthEast Regional Meeting On Numbers. An informal gathering of number theorists and combinatorialists in the south-eastern USA. Email list, links to meetings. KUL-RUG Joint Seminar - Number Theory and Algebraic Geometry meetings at Katholieke Universiteit Leuven and University of Gent, Belgium. Arizona Winter School - Annual week-long instructional meetings for graduate students in number theory. New York Seminar and Workshops - Schedules of the regular seminar and annual workshops. NoMaDS - North of England Algebraic Number Theory Group, meeting termly, based at Durham, Nottingham, Sheffield and Manchester. Fifteenth meeting: Nottingham, 29th April 2005. London Number Theory Seminar - Weekly meetings during term, rotating between University College, King's College and Imperial College. London-Paris Number Theory Seminar - Meets twice per year, once in London and once in Paris. Programmes and abstracts.