Your iPad, like most modern battery powered devices, prefers to be recharged little and often, so no need to run it down every time unless that's just they way things work out. Apple say you should let it run down to almost empty about once a month or so, but no need to do it any more than that. This helps keep the battery meter calibrated so it reports accurate figures in iOS.
There is no special process for storing it for a few days, but if you are going to store it for a few months you should charge to about 75% and then turn it off. You should never store it for too long with no charge as you risk damaging the battery it is sits fully drained for a very long period.
Hope that helps.