Apologies for the tardy reply. I've had a bit of a hectic week work-wise which is set to continue this weekend which means I shall unfortunately be unable to toss a sossie on your barbie. I'm especially downhearted about missing out on the "garden games" so here are a few suggestions should you come unstuck due to the absence of the "gamesmaster".
1. Moss-a-thon. This is not a race against the clock but I suggest a time limit of ten minutes be imposed. Basically, see who can wedge the most amount of moss up one's arse in the given time period.
2. Daffodil-a-thon. Similar to the moss-a-thon only using daffodils. Tactics play a large part though as the next daffodils don't appear until the following spring.
3. Moose-a-thon. Again, similar to the first suggestion. Simply replace one's own arse with a moose's arse.
You could argue that it may be both a little messy and a little tricky measuring the amount of anal moss per combatant, especially when that combatant is a moose. Personally, I would give everyone an identical pile of moss (amount A) and then subtract the residue (amount B) to calculate the amount of anal moss (amount C). The beauty of this method is that one can leave the butt-moss where it is and hence avoid aggravating any particular moose by attempting to retrieve it. Bingo.