I found that by quitting and reopening Calendar on my iMac it would import a 
new entry from other devices.
I haven’t had any serious issues with Hi Sierra on my 7 yo iMac
Cheers 
Marcus 

Marcus Harris 74 iPhone7

> On 28 May 2018, at 5:53 pm, Juliet Kitson <[email protected]> wrote:
> 
> Hello
> Another problem since updating to High Sierra, our calendars on iPhone,Ipad 
> iMac and MacBook air used to update each other automatically but now don't 
> ,how do I fix
> Regards Juliet
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  • Calendar Juliet Kitson
    • Re: Calendar Marcus Harris