Christ even with a quarter of it, we could put on something serious and attract plenty of interest to Hive.
Beforehand you sit down and have a good debrief with some Devs to help cover off likely questions, then you dress the part and engage with as many people as possible.
Then you show what you've achieved. Tangible results. X number of new users. Y number of engagement.
Then you run a contest of some sort to bring people to Hive. €3K for the first user to attract 100/200 new gunuine users or something along those lines.
As for merch, christ with a budget of €25K you could get some decent stuff.
As for the rally car for 1/4 million, Christ, don't get me started! You wouldn't mind if Hive had kicked on and grown after this initiative, but it seems to have done precisely the opposite.