I usually really enjoy parkrun but nearly lost my temper with 2 people wearing those massive dr dre headphones today. Both running on the right after about 6 marshals had shouted "keep left if on your first lap, keep right if on your second"
Apart from that, which seems to happen every week, I enjoy it.
My advice would be to ask again in a couple of weeks once the ballot results have come out, usually the first week in October.,
There is usually quite a rush to get charity places around then and you should be able to get a decent amount of fundraising for it.
There is a fine line between asking for too much of a fundraising target and not enough interest and selling yourself short.