There are really 3 options:
1: Get a cheap "house guitar" which already has a pick-up
2: Either of the easily swappable magnetic pick-ups mentioned
3: Clip-on microphone or single spot stick-on piezo
I would go for option 1 based on simplicity - you know the levels, can keep it plugged in, and it's there for not only those without pickups in their guitar, but also the odd walk-in to the bar who didn't even know it was an open mic night (my best nights as a participant have been when I wasn't prepared and did it on a whim)
Option 2 would sound like ***, but it's an open mic, the talent on display is variable and the aim is simply for sound to be "acceptable" and at least there are no feedback worries
Option 3 can offer the advantage of usability on violins, banjos, etc but will be the most problematic from a feedback and EQ perspective.
Whatever you decide, remember these events are for the fun of all participants, so keep it simple and easy, and don't sweat the small stuff
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