Fix argument to event attendees -- needed request, not request.META
Fix argument to event attendees -- needed request, not request.META

Fixes #51

microcosm-cc/microweb,microcosm-cc/microweb,microcosm-cc/microweb,microcosm-cc/microweb,microcosm-cc/microweb,microcosm-cc/microweb