It's a very terrible one. Other than personal donation and prayers, it's hard to do anything else.
Until late last week, Hong Kong Astronomical Society launched a sale on some books, planisphere, etc. All the money collected (without deducting cost) will be donated. So, I bought some as well, to take the chance to express our support as amateur astronomers. We share the same planet Earth and we're under the same sky.
I've also delayed (or even canceled) the purchase of some equipments to spare the money for personal donation. I understand that these limited effort has very limited effect, but it's just to show my care and concern.
Let's do something.