Here we have all the Mayweek events that I know about in iCalendar format. You can either download the file and import it into your calendar application, or you can copy-and-paste the link into your calendar application's 'subscribe' feature and your calendar application should then receive updates to this list automatically. Either method should work with Google Calendar, Sunbird, iCal (for Macs) and any other program that understands the iCalendar format.
http://www.atkinsfamily.ukonline.co.uk/mayweek_calendar.ics
So it turns out that Sunbird is quite helpful, as it has gone and converted my Mayweek calendar into a web page for you so that I don't have to do it. It has even put hCalendar tags on, not that you will need them because I gave you the iCalendar file already.
Here is the human-readable web page with the list of all the Mayweek events that I know about on it. Most of them overlap. Frequently there are five or six going on at once.