well, it is limited in the DB. you need to go to the database table #__ecalendar_events and change the size of the description field.

ok that's fine, thank you.

Can you also please advise me on how to make the 'pop up' window wider?
(In order to fit more characters horizontally.)

Thanks again.

Sorry, I've just realised there is another problem.
When I insert (say) 1000 characters, all the line breaks are removed.
The description field in the admin panel retains the line breaks - but the user side doesn't. The user sees one continous block of text.

this is normal, because all HTML is stripped from this tag... to change this behavior actually som enew coding would be needed...
to make a popup window widder you need to change the CSS that defines the width. if you can send me a link I can tell you where.

Sending via email now - thank you.