Seminars are by invitation only. That said, one does not have to be an official member to regularly attend a seminar. Each seminar is independent, with its own policy on attendance. Some are very open, while others require official membership. Specialists, mostly visiting lecturers or visiting research associates or fellows may contact the seminar chair directly to request admittance. One may attend a seminar for years and remain a guest. However, there are some benefits to making membership status official.
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