Or a marathon of watching Jace doing . . . stuff. In my family, a "buffathon" is a marathon of watching many Buffy the Vampire Slayer episodes and a McGarrethon is watching several Hawaii Five-O episodes in a row. The "old" Hawaii Five-O, of course, but I suppose the new one would do. JACE-uh-thn sounds more Jace/Jonathon than JACE-uh-thon, though, and the former is how I am pronouncing it.