4 years ago, I did organize a Groupe-travel of 24 people to visit the Beck's brewery in Bremen (and a Budesliga game on Friday night ): Flying ZRH-MUC-BRE//BRE-FRA-ZRH.
Departure on Friday, return on Sunday: which qualified for the weekend fare of SFr 249 + tax in eco.
Dealing with LH Zürich I did get:
* the weekend fare for all of us (originally LH would only have allowed 8 passengers for that weekend tarif on the specific flights I asked for)
* 2 (out of a total of 24) free tickets
* LH's promis to have enough Beck's beer on board on all segments (and yes they did oblige).