Hi Nic,
Yes you can compete on one day only, which is the advantage of the two day events on the calender being considered as two rounds of the series.
However, As you will be entering a "Two Day event" (series or no series) you will have to enter and pay for both days of the event, once entered, what days you ride or how many are up to you. It will be written up as a DNS on the scoreboard for day you choose not to compete.
Check here for some additional info from Peter Sampson, re; the series.
http://www.trials.com.au/absolut/articl ... cleID=1690 Hope this helps
Cheers
Don Rolands
MTCQ Comp Sec