The correct formation of this sentence will be: "This meeting is of utmost importance."
Yes, the sentence "I too look forward to meeting with you" is grammatically correct. It means you are expressing anticipation for meeting the other person.
No, the sentence is not grammatically correct. It should be: "I will take notes at the meeting." Remember to capitalize the first letter of the sentence and add a space after the period.
Yes, it is perfectly valid.
No, it's having a meeting or attending a meeting (or you might be holding a meeting if you're the boss).
Yes, the sentence is grammatically correct. It conveys a positive expression of anticipation to meet a group of people in the future.
yes
Yes, that sentence is grammatically correct. It effectively conveys the message that all the meetings you had planned for today have been canceled.
Yes, that is grammatically correct.
Yes, but it would have to be quoted. ex. "At which time should I come over?"
'In lieu of my absence' is a phrase, not a sentence. As a phrase, it is grammatically correct, and could form part of a sentence, although it is not easy to think of such a sentence. It means 'Instead of my being absent ... ' So, how about 'In lieu of my absence, you have my presence!' as a jocular exclamation made by someone who turns up at a meeting for which s/he has previously given an apology for absence.
not
No, it is not.