Tvheadend

Hi i'm wondering around in the world off tvheadend

i'm making a 10user IPTV service for in our little bed&breakfast
forwarding some DVB-T and 4 own services
all is working really OK nice work !!!

2 off these own services are eventchannels which i use occaisionaly.
by multicasting too a multicast address which TVheadend pick's up smoothly.

but when there is no event there is no picture !

is there a option to let tvheadend switch to a other service when the main service is not there

like a "service temporaly not available" slide

grt
MVE