Disappointing outcome

Great opportunity to ride some sweet Sparrow Hill and Kowen single track, for a good cause (fundraising for Bec Henderson), in an interesting format (team pairs - ride with your buddy). Two x 25 km loops, passing through the event centre twice each lap.
Spoilt for me (and my team mate) by the imposition of a previously unannounced or even foreshadowed cut off time. There was a mention of it in an e mail sent out late Friday, well after I'd left for the ACT, but even that described the cut off as TBA.
After a 9.30 am start, we got pulled out of the race at about 3/4 race distance at about 12.15 pm. Plenty of daylight left, but maybe they were spooked by a need (again, previously undisclosed), to be bumped out of the event centre by 4.00 pm? We were on track to finish by about 1.15 pm, so I have no real idea why it was done, and no explanation other than "that was what they had decided" was offered at the time.
I'm not the fastest rider in the pack, but I've finished every event I've entered, except for the infamously wet 2010 Capital Punishment, a Rocky Trail event at Stromlo and an 8 hr solo attempt at Lithgow, where on both occasions my back gave out on me.
So very disappointed at this arbitrary act, which denied us a second run through the great Kowen section. We left the event with a sour taste in the mouth - and it wasn't just the dust.....