The All In One Event Calendar is one of the best event managers around appearantly. It is easy to install and use, more importantly one can import various types of calenders, I tried linking to a google calendar and that went withouit a hitch. This means one can create events in a google calenders and they will be added to the All In One on your website.
The google calendar will have to be shared, either as a public calender or ????.
I do have some issues with this plugin, In the widgets and pages that display the events a lot of fonts are set, also with the !important tag. This means that you have to spend a lot of time disabling fonts and setting your own. This is a really annoying habit of plugin makers: You Are A Plugin. The end user would like to fit the data in THEIR design and use THEIR fonts and color settings.
One should also make it easy (and possible) to link/use CSS copied from the plugin into a theme child. Now one needs to override the css in the child theme but this can result in a jumpy display when the page is loaded.
One can see it in action on my test site: be sure to have the lines theme active.