Please take a moment to let me know if you're going to be able to come, if you have a spouse, significant other, long dead second-cousin, etc. that will be attending with you.

Also, let me know how many vegetarians there are amongst us and if you have any cat allergies I should be aware of.

[ will will not] be able to attend this Friday.

Further, I [ will / will not] be dragging someone else along with me.