Under participatory democracy people can participate as much or as little as they like. They are not obliged to vote in every referendum or attend every public meeting, but they have the right to. If they only care about a few political issues, they can just vote on those and ignore everything else. That way they get to have their say on just the issues they care about without becoming part-time citizen-politicians. Moreover, that would be more effective than simply voting for a politician once every five years because it would allow them to specifically vote on the issues they cared about rather than having to support an all-or-nothing manifesto that they will probably only partially agree with.