I have created an official extension, available in the Chrome Web Store:
The recent changes to Google Calendar are looking nice, but unfortunately the header and navigation take up far too much space when using my 13" MacBook. For a compact Google Calendar header in your Chrome browser, take the following steps:
#vr-nav { display:none; } #onegoogbar { display:none;} #vr-header { display:none; }
Done!