The citizens are involved in the vote counting and suprevising the vote counting. We have vote-count duty like you have jury duty.

Keep in mind that the Swiss vote at least four times a year. Direct democracy and all that. So the campaigning is not as hopped up as the US version, but much more low key. In addition to the people in the village squares, there are also public poster boards in strategic locations where parties get allocated space. I don't know by what method, but I would assume based on how many votes they got the last round? Anyway, these are poster boards exclusively used for election purposes, there is never anything else there. The posters are usually for yes/no on various referendum questions, and for persons in the case where there is also elected positions up. The voting booklet sent out includes the text of all the questions, as well as the opinions on the questions of 'all' parties and pressure groups (again, I don't know how these groups are selected).