Until Nov 2.
http://www.champions-online-wiki.com/wiki/Blood_Moon
For this year they've added action figures of the 13th undead heroes; you have to collect 3 parts to assemble each of them, just like the winter AFs. That's 39 parts!
And all costumes are on sale for 20% off at the C-Store until 10 am Pacific on the 1st.