Hello,
If the data was inputed on a customization screen or a default screen it goes to Google in the same format. As you can probably see, you get a separate Method calendar in your Google calendar. Also, each Method user has their own calendar and activities are only assigned to one Method user. I took a look at the share permissions in Google calendar. It looks like any email in your custom domain, if you have one, can have full permissions (eg. g.bilous@method.me is in the method.me domain) but anything outside of the domain can only have 'See only free/busy' permissions. The portal is the only way you can have non-Method users access Method information. The non-users would have to be somewhere in your system so you can have them register for a portal.
Greg