Hello, I have a suggestion for IETF meetings in the US and Canada. Unfortunately sometimes a visa processing (to Canada and the US) might take 2 to 3 months. Since invitation letters are usually necessary components to apply for a visa, sometimes the time for visa processing is not enough for planning for this trip (reservation, buying a ticket, etc.) Each IETF is usually every 6 months. I do not know whether there is any possibility to change the start of registration date that at least there is minimum 3 complete months before the IETF meeting (also after considering possibility delay in opening registration, etc.) Thanks, Best, Hosnieh P.S. This of course applies to non US citizen