The 27th Annual Kagyu Monlam Chenmo dates are locked in, and you can get the complete schedule by clicking here. Of note: apart from preliminary teachings on December 20, 21, and 22, the gathering begins on Christmas and runs to New Year's Eve.
This is right around the corner, so now is a very good time to make travel arrangements. If you find that you cannot go, then the next best thing is to sponsor offerings, and that can be accomplished by clicking here. If you cannot manage that, then what can I say? The estimated turn-out is in excess of 5,000 monks and nuns, and somebody has to feed them, arrange for flowers, butter lamps, and so forth.
Personally, I recommend flowers. A one-day flower offering is only USD $200, which is within everyone's reach, even you are as poor and miserable as me.
One would wish that flowers rain down.