Geoff has announced, "The Open Mic is moving into a new phase as I try to make it better serve the singer-songwriter open mic community. Starting in May, the evening will be devoted entirely to open mikers. Your suggestions and comments are welcome."
I can speculate on the reason for the format change but will leave further elaboration (or not) to Geoff. Whatever the reason, Geoff and the remaining features, who are always top notch, deserve the community's full support.
From the Cantab calendar:
April 8 - Ed White
April 15 -
April 29 - Cosy Sheridan
Whether you are a young musician just starting out or a Cantab veteran who has not been back for some time, come down to the open mic to see Geoff and his last remaining features, and continue to give support to the series after the format change.
From the Cantab website, these are the best open mic guidelines I have ever read. I am sure Geoff would not mine others using his model.