The Spreadsheet Shortcut Scavenger Search

This may come as a shock but ; is in fact not a real letter, i is your letter (I realise you know how to make text italic so this is more useful).

For this challenge, record a video where you are pitching one of these products to an investor. The video should show the people pitching, the picture of what you're pitching and the poster. Also, scroll down for the cipher key to complete the secret puzzle of the extra letter.
Cypher key
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Book tickets for Excel Comedy & Mathem-antics Sun-Fri at 1:30PM

Shortcuts in action
Ctrl ; enters current date on Windows. It can be part of a sentence too.
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Find more posters on the Spreadsheet Shortcuts Scavenger Search around Edinburgh.