Give people enough warning to prepare the help you are asking them to provide.

Help has a shape, and the shape depends on time. Asked with notice, a person can rearrange a shift, bring the right tool, or think about the problem before they arrive. Asked at the last minute, the same person can only improvise or disappoint you, and often both. Short notice quietly moves the cost of your planning onto someone else.

Look at what you will need from other people in the next two weeks and say it now, even roughly. A vague early warning is usually more useful than a precise late one.