Postpone topics for "later"

[Grissess]

This could help in a number of circumstances:

• When a presenter is not present or not ready, and will present next week.
• For purchases that can be done later, typically the end of the year

...and probably more.

Not sure yet how to implement--maybe (1) style them specially and (2) shove them to the bottom of the order, or show them elsewhere?

[lannonbr]

I'm planning on making an update in how talks appear, so this likely can be an addition in that update