One of the things that has been repeatedly drilled into me over the past year or so is the fact that if you want people to do things for you, you’re most likely going to have to harass them. (I don’t mean literal harassment, by the way – please don’t commit a criminal offense and say I encouraged you.) This is true especially when working with highly busy people like managers and professors. If you want something, you can’t just assume they’ll intuit that and give it to you – you have to ask (and assume they’ll forget, then ask them again). If you need them to do something for you, you’ll need to remind them, and inform them of the deadline, likely multiple times. Everyone has their own problems to worry about and the thing you need might not be top of mind. The burden of remembering is on you.