Pitru Paksha, Day of the Dead and the quest for a guest list of ancestors

So, today marks the end of the 16-day 'Pitru Paksha' period - Fortnight of the Ancestors. Go through the rituals, and the general idea is that if you and your ancestors are/were Hindu, they should come over and pay you a visit. This show of respect for one's progenitors is lovely and touching. Mexicans, too, have their 'Dia de los Muertos' (Day of the Dead) in end Oct-early Nov, a syncretic blend of indigenous Mesoamerican (Aztec and Maya) traditions and Roman Catholic holidays to honour and remember family and friends who have made it out of our temporal cabin. All Souls' Day does much the same for Western Christianity, that got secularised down the line into Halloween, thanks to the more merch-minded, cosplaying Americans.

Without at least two direct lines of ancestors, we wouldn't be where we are today - both biologically and historically. So, it's a bit like Founders' Day with you - and your kids - as the company or school. Some of the ancestors will have been people you knew, even loved ones. So, raising a proverbial glass to them is acknowledging a debt as well as a show of fondness. But keeping such remembrances in mind, not all ancestors may be welcome. That voluble Nanaji; that overbearing Pardadi.... Perhaps there is an algorithm/shloka/memo that could have the ancestors we want to have over today drop by, while leaving out the others?