iOS: how can I disable calendar alerts? Is it possible to disable alerts coming from the Calendar app? I am talking about the on the screen pop-ups that come before the start of an event. You can turn off the alert sound in the Preferences, but I don't see an option to turn off the alert pop-up.

(My iPhone calendar is synchronized with Google Calendar, and so I already alerts through some other means, and don't want to get them one more time on the iPhone.)
No, you can't disable pop-up reminders globally.
You can turn off an alert by accessing the event properties in the Calendar app, but then 
it will be disabled in Google Agenda too.