numerous ways, publish a book on memo, gamble on satoshidice (for 24hours :), once we have a script ready in a few weeks you can test that. next 9.5 wks spread word, notify businesses
click like on every single comment on Memo with minimum amount of 546 satoshi, at today's rate that's roughly $25 for 5000 tx (stress test script will be even cheaper)
organise a coinroll with handcash, keep the coin rolling for 24hours??? Here is to generate ideas, no fixed rules, whichever ways you can think to push transactions *involve merchants*