Display events marked as not attending clearly

right, seems a good start is to show this event with a color of less opacity and possibly striking out the event name

I am not sure if I am using the google calendar correct :D.

All my events has the same opacity, even the events that I am not attending or events that I am not invited (For example 'Holiday in Brazil' or 'UES calendar').

On my personal account I only have events without any participant. And following the suggestion all the events will be showed with less opacity, what does not make sense for me.

My suggestion for now is only change the opacity of events that has a attendee list[1] and the user is part of it and the participation status is 'Declined'

I am not sure if this is enough, but this is the only reliable information that we can guess from a event.

Even that can be trick to guess since we need to know the user e-mail to check for it in the attendee list.
Right now we use the same login username as calendar name but this will change with the multiple calendar sync.

OBS: this will cause a impact on event drawing.

[1] https://developer.ubuntu.com/api/apps/qml/sdk-15.04.1/QtOrganizer.EventAttendee/

We should follow the design guidelines in the spec. See the section about Event Types:
https://docs.google.com/document/d/1UZEKYB1JS0CO0gEiPu701rhZSHimJYq6EgeLNhxG_1I/edit#heading=h.lm7pcvsmz78v

Fix committed into lp:ubuntu-calendar-app at revision 807, scheduled for release in ubuntu-calendar-app, milestone 0.5