Part view cut off

You can adjust the CSS to make the popup go left. Something like this works on the default CSS:

#spiffy_events_calendar .calnk { position: relative; }
#spiffy_events_calendar .calnk a:hover div { right: 25px; }

Thanks for that – but it doesn’t seem to work.
My theme is Weaver II and you can look at the site to see the problem
https://knucklascommcentre.org.uk/calendar/?month=apr&yr=2013

I thought you meant the widget. In the main page calendar you would use something like this:

.calnk { position: relative; }
.calnk a:hover div { right: 25px; }

Thanks, that works.
However I now have the problem on the left (Sunday) side!
Admittedly not as often needed, but still..

Perhaps a better option in your case is to make the calendar less than 100% width so the popups fit better.