trigger trgCreateEvents on ID_Review_Meeting_IDs__c (after insert, after update, after delete)
{
if (trigger.isAfter)
{
    if (trigger.isInsert)
    {
        if(Schema.sObjectType.ID_Review_Meeting_IDs__c.isAccessible() && Schema.sObjectType.Event.isCreateable() && Schema.sObjectType.Task.isCreateable())
        {
            List<ID_Review_Meeting_IDs__c> objIDReviewMeetingIDs = Trigger.new;
            system.debug('Debug 1:' + objIDReviewMeetingIDs.size());
            List<Id> lstIDReviewMeetingIDs = new List<Id>();
            for(ID_Review_Meeting_IDs__c objIDReviewMeetingID : objIDReviewMeetingIDs)
            {
                lstIDReviewMeetingIDs.add(objIDReviewMeetingID.Id);
            }
            system.debug('lstIDReviewMeetingIDs:'+lstIDReviewMeetingIDs);
                List<Event> objEventsToBeInserted = new List<Event>();
                List<Task> objTasksToBeInserted = new List<Task>();
                List<ID_Review_Meeting_IDs__c> objIDReviewMeetingIDList = [SELECT ID_Review_Meeting__r.Name, ID_Review_Meeting__r.Meeting_Date__c, Invention_Disclosure__c FROM ID_Review_Meeting_IDs__c WHERE Id IN :lstIDReviewMeetingIDs];
                for(ID_Review_Meeting_IDs__c objIDReviewMeetingID : objIDReviewMeetingIDList)
                {
                    Date meetingDate = objIDReviewMeetingID.ID_Review_Meeting__r.Meeting_Date__c;
                    Date meetingDate1 = objIDReviewMeetingID.ID_Review_Meeting__r.Meeting_Date__c;

                    Event objEvent = new Event();
                    if(Schema.sObjectType.Event.fields.Subject.isCreateable() && Schema.sObjectType.ID_Review_Meeting_IDs__c.fields.ID_Review_Meeting__c.isAccessible() && objEvent.WhatId != Null && objEvent.WhatId.getSobjectType().getDescribe().getName()=='ID_Review_Meeting_IDs__c')
                        objEvent.Subject = objIDReviewMeetingID.ID_Review_Meeting__r.Name;
                        objEvent.WhatId = objIDReviewMeetingID.Invention_Disclosure__c;
                    if(Schema.sObjectType.Event.fields.DurationInMinutes.isCreateable())
                        objEvent.DurationInMinutes = 0;
                    if(Schema.sObjectType.Event.fields.ActivityDateTime.isCreateable() && Schema.sObjectType.ID_Review_Meeting_IDs__c.fields.ID_Review_Meeting__c.isAccessible() && objEvent.WhatId != Null && objEvent.WhatId.getSobjectType().getDescribe().getName()=='ID_Review_Meeting_IDs__c')

                        objEvent.ActivityDateTime = DateTime.newInstance(meetingDate.year(), meetingDate.month(),meetingDate.day());
                         //objEvent.ActivityDateTime = objIDReviewMeetingID.ID_Review_Meeting__r.Meeting_Date__c;
                        objEventsToBeInserted.add(objEvent);
                       system.debug('Events:'+objEventsToBeInserted);
                    Task objTask = new Task();
                    if(Schema.sObjectType.Task.fields.Subject.isCreateable() && Schema.sObjectType.ID_Review_Meeting_IDs__c.fields.ID_Review_Meeting__c.isAccessible() && objTask.WhatId != Null && objTask.WhatId.getSobjectType().getDescribe().getName()=='ID_Review_Meeting_IDs__c')
                        objTask.Subject = objIDReviewMeetingID.ID_Review_Meeting__r.Name;
                        objTask.WhatId = objIDReviewMeetingID.Invention_Disclosure__c;
                    if(Schema.sObjectType.Task.fields.ActivityDate.isCreateable() && Schema.sObjectType.ID_Review_Meeting_IDs__c.fields.ID_Review_Meeting__c.isAccessible() && objTask.WhatId != Null && objTask.WhatId.getSobjectType().getDescribe().getName()=='ID_Review_Meeting_IDs__c')
                        //objTask.ActivityDate = DateTime.newInstance(meetingDate1.year(), meetingDate1.month(),meetingDate1.day());
                        objTask.ActivityDate = objIDReviewMeetingID.ID_Review_Meeting__r.Meeting_Date__c;
                        objTasksToBeInserted.add(objTask);
                        system.debug('Tasks:'+objTasksToBeInserted);
                }
                if (objEventsToBeInserted != null && objEventsToBeInserted.size()>0)
                    insert objEventsToBeInserted;
                if (objTasksToBeInserted != null && objTasksToBeInserted.size()>0)
                    insert objTasksToBeInserted;
        }
    }
}