When we are asked this question, in our district, we get a Tom Sawyer response. For example,
Scoutmaster: I think the district should have a STEM event.
District Chair or DE: OK, so you’re hosting the next camproee!
Cubmaster: We really need some help in recruitment.
District Chair: Great, we will make you district membership chair.
So my advise is to listen to what they have to say, take the good ideas and make a plan, get the help you need and execute. Please don't throw it back on their shoulders of the one who suggested it unless they are volunteering to take it on.