Really it is professional work and good justification for every event .
I am agree with your justification in your sheet but i have some comments about the following
1- ” 6- Material Submit Form Lighting Fixture ” : I think it is clear event because “Consultant reply planned to be maximum on 15-Apr-12 ,but actually the reply sent on 12-May-12 with a lot of delay
2- “16- Site Work Instruction Start date for T.V System and P.A System ” : I think it is not event because ” Activity has a total float 78 days which is more than the delay period”.
3- “18- Site Work Instruction Change Painting Color Code ” : I think it is clear event because ” SWI after related material delivering to site Date 20-Oct-12 according to the time schedule”.