Need help with hw...easy 10 points?

i need help with mii hw on world mission sunday. i need to noe a few things. one- why do we celebrate world mission sunday two- what can we do on world mission sunday and three- why is it important. PLEASE HELP me i looked alot of places in cant find anything. It will help a lot if u gave me websites i can go on cause i just have to bring papers about world mission sunday to school please help it will mean a lot to me thanks sooo much