Hi dear
I came up with an idea to organise a donation of second hand items for charity. Everyone who would like to help could donate things to those who are in need and find them useful. The collection will have ended by the end of the month.
I am cordially/kindly inviting you / I would like to cordially/kindly invite you to the event / Your presence would be greatly appreciated as it is free and you can help others.
One day it might be us who need help and those whom we are going to help now may reciprocate our kindness.
I would also like to ask for a favour to pass the information about the event on to your friends, family and other people, to donate items they do not need and which may be useful for those in need.
Lots of love,
XYZ