To get them there on time it might be more effective to compel them to meet for tea and biscuits before the meeting. Mind you they'd have to make sure they offer decaf as well as ordinary tea, plus green tea or redbush and all the other teas. Then there are the coffee drinker. Full caf, decaf, Fairtrade, not Fairtrade, Nescafe, not Nescafe, instant and ground. Don't forgot the milk. Jersey, full fat, semi skimmed, skimmed, lactose free and the rest. Brown sugar, white sugar, light golden sugar, sugar cubes and granules making sure they get Fairtrade and non Fairtrade varieties. Oh and a selection of honey for the non sugar users who still want a natural sweetner. Oh no what about those who want artificial sweetners. They'd need to make sure they have the full range in both tablet and granule form.
Then there are the biscuits. It would seem on the face of it to be simple. Just get a selection but what about the vegetarians and the vegans. Don't forget those who need gluten free or can't eat nuts. And watch how everything is stored.