I also got errors during install on a portal with Events 3.1.0 and Calendar 03.00.10 installed:

SQL Execution resulted in following Exceptions: System.Data.SqlClient.SqlException: Invalid column name 'TimeZoneOffset'. Invalid column name 'SendReminder'. Invalid column name 'ReminderTime'. Invalid column name 'ReminderTimeMeasurement'. Invalid column name 'ReminderFrom'. at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(SqlConnection connection, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText) at DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script, Boolean UseTransactions) CREATE PROCEDURE dbo.DNN_EventsAVCalendarImport ( @CalendarModuleID int, @EventModuleID int, @Version nvarchar(8), @TimeZone int, @PortalID int, @ImportCategory bit, @ImportLocation bit ) AS IF EXISTS(SELECT * FROM DNN_Calendar) if @Version = '03.02.00' BEGIN INSERT INTO DNN_Events (EventID, ModuleID, EventDateBegin, EventDateEnd, EventTimeBegin, Duration, EventName, EventDesc, Importance, RepeatType, Every, Period, Reminder, Notify, CreatedBy, CreatedDate, Approved, PortalID, Signups, MaxEnrollment, EnrollRoleID, EnrollFee, EnrollType, PayPalAccount, PayPalPassword, Cancelled, ImageURL, ImageType, ImageWidth, ImageHeight, ImageDisplay, Location, Category, TimeZoneOffset, SendReminder, ReminderTime, ReminderTimeMeasurement, ReminderFrom, SearchSubmitted) SELECT EventID, @EventModuleID as ModuleID, EventDateBegin, EventDateEnd, EventTimeBegin, Duration, EventName, EventDesc, Importance, RepeatType, Every, Period, Reminder, Notify, CreatedBy, CreatedDate, Approved, PortalID, Signups, MaxEnrollment, EnrollRoleID, EnrollFee, EnrollType, PayPalAccount, PayPalPassword, Cancelled, ImageURL, ImageType, ImageWidth, ImageHeight, ImageDisplay, Location, Category, TimeZoneOffset, SendReminder, ReminderTime, ReminderTimeMeasurement, ReminderFrom, 0 FROM DNN_Calendar WHERE ModuleID = @CalendarModuleID END ELSE BEGIN INSERT INTO DNN_Events (EventID, ModuleID, EventDateBegin, EventDateEnd, EventTimeBegin, Duration, EventName, EventDesc, Importance, RepeatType, Every, Period, Reminder, Notify, CreatedBy, CreatedDate, Approved, PortalID, Signups, MaxEnrollment, EnrollRoleID, EnrollFee, EnrollType, PayPalAccount, PayPalPassword, Cancelled, ImageURL, ImageType, ImageWidth, ImageHeight, ImageDisplay, Location, Category, TimeZoneOffset) SELECT EventID, @EventModuleID as ModuleID, EventDateBegin, EventDateEnd, EventTimeBegin, Duration, EventName, EventDesc, Importance, RepeatType, Every, Period, Reminder, Notify, CreatedBy, CreatedDate, Approved, PortalID, Signups, MaxEnrollment, EnrollRoleID, EnrollFee, EnrollType, PayPalAccount, PayPalPassword, Cancelled, ImageURL, ImageType, ImageWidth, ImageHeight, ImageDisplay, Location, Category, @TimeZone FROM DNN_Calendar WHERE ModuleID = @CalendarModuleID END SET IDENTITY_INSERT DNN_EventsCategory ON if @ImportCategory <> 0 INSERT INTO DNN_EventsCategory (PortalID, Category, CategoryName, Color) SELECT PortalID, Category, CategoryName, Color FROM DNN_CalendarCategory WHERE PortalID = @PortalID SET IDENTITY_INSERT DNN_EventsCategory OFF SET IDENTITY_INSERT DNN_EventsLocation ON if @ImportLocation <> 0 INSERT INTO DNN_EventsLocation (PortalID, Location, LocationName, MapURL) SELECT PortalID, Location, LocationName, MapURL FROM DNN_CalendarLocation WHERE PortalID = @PortalID SET IDENTITY_INSERT DNN_EventsLocation OFF .

Tony,

thank you for replying, but this is not the correct solution for me, as I already use this DotNetNuke installation with 50+ modules w/o other issues - so it cannot be a general database permissions problem (except Events does not use default database access).