For those of you unfamiliar with ancestral work, those that came before us have as much a vested interest in our success as we do. Their good works are the reason our respective familial lines still exist, and were our lines to terminate, they'd be without anyone to remember them. Their existence would effectively end and their stories would go untold, letting them slip loose of the World's memory.
It is in this time that telling their stories and drinking deeply of the familial well is most important. Honor them through your remembrance and give thanks for every time in which you feel like something very much should have not gone your way but did. If your life or livelihood has ever been threatened and yet miraculously saved, thank them for it, as even if they were not directly responsible, there's a good chance they've had a hand in it.
This doesn't need to be a particularly fancy affair, so if you're the broke college student magician or frugal kitchen witch, you can brew a cuppa and consider those who came before you as you sip at it. Share that warmth with those who are responsible for the warmth that pumps its way through your veins. You may find that this is a deeply emotional expereince, and that is to be expected. Should your family line pass through you to create an heir to the bloodline, you will do the same down the line when your family regards you in the same way.
It doesn't take much effort, but its worth it in the end.
For those of us who are a bit more adventurous and comfortable with our ancestors, I recommend sharing food and drink. Create a feast and share part of it with them. Share some of your kids' Halloween candy with them and tell stories about how your family took you out Trick Or Treating when you were young or share stories about what you and they did during this time of year. Celebrate their lives and what they've added to yours, and perform ritual offerings alongside this to properly thank them.
It doesn't need to be extravagant, but it does need to be sincere and heartfelt. Keep them in mind this time of year and don't be surprised if beneficial changes are had. ;)