Firstly, it’s great to see a thread on local issues rather than yet another national one.
The problem may be that you’re not conspicuous there and people probably forget it’s on, no matter how much you publicise it.
I think you should maybe look to gatecrash piggyback other peoples meeting. Schools have parent evenings, why not try setting up a table there. Does the local councillor hold surgeries, if so make it a joint surgery, often the issues raised will be pertinent to you both. How about the church or other community groups, they must have events/meetings you can piggyback. The added bonus of course is you don’t have to provide the public liability insurance as it’s not your meeting.
Also why not just set up a street surgery outside the Coop and engage people as they wander by. Imagine how many you’d get from 3 to 7pm. Pick a road and walk down it knocking on all the doors. Introduce yourselves and ask how you can make local life better. It won’t take as long as you think, Jehovah witnesses do it all the time – I’m guessing you’ll be slightly better received.
Why not set up a little safer neighbourhood drop in post box in the post office, coop or newsagent with blank postcards next to it so the busy people can write down what concerns them and pop it in the box, you could collect them weekly.
Just a few ideas.