We set the schedule at the beginning of the year. Same day each week. Since we have to ask the county for permission to use the school rooms, we need to commit to this when we submit for the permit. As a Tiger Leader last year, I was told "if you volunteer, you can have input on the schedule" this is a strong draw in our pack to get adult leaders to give their time. After almost two years, the meetings are on the same nights, same room, same everything. This way, when considering other activities, (sports, etc.) my den parents know they will have meetings those nights. We also post all this on the pack calendar and send weekly emails reminding people of all upcoming scheduled events.
It is unfortunate that your DL is too busy or not making the effort. In our den we have addressed the business travel issue by having multiple Co-DLs. This allows meetings to take place as planned even when one of us is traveling. Hope that helps, good luck.