We also bought 180ml glasses from a well-known Scandinavian furniture place for the event. We got 50 glasses - which was much more cost effective than disposables (and the kitchen faeries were able to keep up). Pre-heating the glasses was done in a bucket of hot water - which was superbly effective.
Nice. Love the idea of using the glasses and "cup warmer".
The only downside was using a trestle table. On Sunday I brought some pieces of wood to raise the machine to a less back breaking height,
Yep, workstation ergonomics is a biggie when doing that many coffees.
Well done on the fundraiser effort Kevin, I'm sure you also took a lot of people a few steps further in their coffee journey at the same time.