1."A big thanks in advance for your diligence and cooperation"
diligence & cooperation
careful and persistent work or effort.
the process of working together to the same end."they worked in close cooperation with the AAA"
2."If you are having challenges reaching your four-shift minimum, please contact us"
having challenges ~ing
dispute the truth or validity of."employees challenged the company's requirement"
3. "you are a first-time Volunteer or seasoned TIFF veteran"
a person who has had long experience in a particular field.
4."you may have well-worn copies of the Official Film Schedule"
5."highlighted and dog-eared to mark your Festival dreams"
fold down the corner of (a book or magazine), typically to mark a place.
6. "The days ahead will be a flurry of films"
a number of things arriving or happening during the same period."a flurry of editorials hostile to the administration"