One of the events we've used in fun flys is called "fast/slow". You need a timekeeper and two volunteers, one at each end of the field.
hehe i did one of those a few months back with my Outlaw Delta, i did the slow on a Master 11x4 and prophung most of the way, i got bored at 52 seconds and throttled out for the last 20 yards of 100 ( their limit was just 30 seconds max???!!!!! ) for my fast the engine died after a long life but still got 94 MPH
i would have got first but his plane did a 120 mph run ( which mine with working bearings can do asleep ) and he maxed the 30 seconds on the slow, my extra 30 or so didn't help, booooooooo hisssssssss
maybe i should suggest one for our club fly for fun.