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Try this, I think the problem could be invalid characters in the url:
form_artistSelect = urllib2.quote(form.cleaned_data.get("artist_select"))
form_city = urllib2.quote(form.cleaned_data.get("city"))
form_state = urllib2.quote(form.cleaned_data.get("state"))
mile_radius = urllib2.quote(form.cleaned_data.get("radius"))
Source:stackexchange.com