Hi Lois,
I’m sorry to hear that you’re having so much trouble with your site. The fact that your issues persist even after disabling the plugin suggests that the cause is somewhere else in your site. I’m glad to hear that you are keeping regular backups. That is an important best practice to follow in case anything goes wrong.
I would work with your host to restore functionality to your site with the Events Calendar plugins disabled. Once you’re sure everything is working as it should, re-install and enable the Events Calendar plugins and see if everything works. I recommend taking a backup before this step, just to be safe.
Please let me know how this goes.
Thanks,
Sky