I've been having the same issue described in this post. It looks like it has been marked resolved as unreproduceable but with out any concrete resolution.
But iCal imports from the same version of Events Manager and WP from another site I manage, http://vallejozencenter.org/ , work fine.
No luck with the following troubleshooting methods:
Switched to a generic template
Replaced all of the Events Manger plugin files.
Disabled all plugins except Events Manager
Could it have something to do with the far greater number of events at artvallejo.org? I tried importing a single event. Same error with events from artvallejo.org, but single events from vallejozencenter.org work fine.
I opened both events in a text editor and found that there are line breaks missing in the artvallejo.org files. This is what broken event looks like in TextWrangler:
BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//5.52//ENBEGIN:VEVENT UID:791fb6d1-1906-4bcd-94ee-85b8043a00e1 DTSTART:20140321T023000Z DTEND:20140321T040000Z DTSTAMP:20140314T172723Z SUMMARY:Third Thursday Jazz Nights - Koham Press - Thu\, Mar 20\, 2014 - 7:30 pm - 9:00 pm DESCRIPTION:Join Leo Cavanagh on Guitar and Guy Arrostuto on Piano\, for the first Third Thursday Jazz Night!\n\n$5 at the door - all proceeds go to the musicians! LOCATION:Koham Press URL:http://artvallejo.org/events/third-thursday-jazz-nights/ END:VEVENTEND:VCALENDAR
...and this is a functional event
BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//5.52//EN BEGIN:VEVENT UID:5256ec9d-4d4e-4652-8df4-2c7e3d3103fb DTSTART:20140405T070000Z DTEND:20140405T180000Z DTSTAMP:20140307T211454Z SUMMARY:Buddha’s Birthday - Vallejo Zen Center - 5 Apr 14 00:00 DESCRIPTION:Zazen at 9:30 AM\n\nLecture at 10:00 AM\n\nCeremony at 10:20 AM LOCATION:Vallejo Zen Center URL:http://vallejozencenter.org/calendar/buddhas-birthday-4 END:VEVENT END:VCALENDAR
In the broken event the PRODID and BEGIN:VEVENT lines and the END:VEVENT END:VCALENDAR run together. When I break up those two items with a carriage return the event imports with no problem.
(When I copied and pasted the broken event here the line breaks in the broken file appeared, so apparently those are the wrong kind of line break. TextWrangler shows an upside-down question mark there when I enable "show invisibles".)
Question is -- Why is this happening and how do I fix it?
Other differences between artvallejo.org and vallejozencenter.org:
artvallejo.org uses a lot of different locations with the google map enabled; vallejozencenter.org only has one location.
artvallejo.org events frequently have featured images, links to other sites and more verbiage; vallejozencenter.org events are, well, simpler and more Zen.
Thanks for any advise - I'd really like to get this to work.