Hello postpunkonline,
Thanks for contacting us! There isn’t exactly a way to do that out of the box and unfortunately that level of customization goes beyond the scope of the forums.
That said, I can give you a few ideas!
In the Events Settings > Display tab, I would change ‘Events Template’ to ‘Default Page Template’ to activate the sidebar for all events pages. (Your results may very depending on your theme)
Then I would use CSS to simply hide the sidebar on pages you want wide, like /events.
For instance, using the Twentytwelve theme, I used the CSS
.events-archive .widget-area { display: none; }
to remove the sidebar, and then
.events-archive .site-content { width: 100%; }
to make the calendar full size.
Your results will vary though, depending on the theme you are using, but this is the rough idea.
Does this make sense? Let me know if this doesn’t work for you.
Cheers!
– Casey Driscoll