jjjnettie - I like the mini series idea too. The baddie, McCloud (don't much like making McCloud the baddie since the maternal part of my family come from that clan - but all in the interest of art

) trying hiding the Treasure of McNaught from innocent victims. Love interest? Mmmm we all, but more specifically??

Venus!
Lots of action as people chase up mountains & to quiet beaches. Violence when an imaginary beaches/quiet mountain spot is filled with flood-lit rock band concerts, perhaps?
Some Men from UpNorth forced to turn a blind eye...
Quiet despair - definitely need McSomeone with good acting skills for that one - or simply choose anyone from IIS who still has not seen the comet. Conspiracies, as you already suggested!
A side story about a broken tripod

.
Another side story about the first (hastily arranged!) wedding taking place on a beach with McNaught blazing in the background.
More violence as the official wedding photographer forgets about the bride & groom...
Intrigue as many people suddenly succumb to comet fever and start the Monday feeling strangely blue

(I'm one of those!) and of course the side story about some se who see this as the Sign they were waiting for.
Something for everyone.
Sorry for being silly - I suppost that is the humour part
Seriously, a book on the comet is a good idea and I bet someone, somewhere, has already started writing it.