one way you can "get out" of doing all the work is to have plans when that work needs to be done. "oh NG, i am sry, but i have to xxx before the party so can you get ready for your friends? thanks, you are so awesome!"
that will do 3 wonderful things for you: 1. go and do your fabulous plans and have fun. 2. get NG to do his share 3. throw in there a "you are awesome" and make him feel so good.