don't show cancelled presentations on schedule list
don't show cancelled presentations on schedule list

python-spain/symposion,pyconau2017/symposion,pinax/symposion,pyconca/2013-web,NelleV/pyconfr-test,toulibre/symposion,pyohio/symposion,faulteh/symposion,toulibre/symposion,TheOpenBastion/symposion,pyohio/symposion,NelleV/pyconfr-test,mbrochh/symposion,euroscipy/symposion,pyconau2017/symposion,pydata/symposion,mbrochh/symposion,miurahr/symposion,euroscipy/symposion,pyconca/2013-web,TheOpenBastion/symposion,python-spain/symposion,pydata/symposion,pinax/symposion,miurahr/symposion,faulteh/symposion