If your “community event” has such a high carbon cost of needlessly burning fossil fuels and destroying tires, not to mention the noise pollution and safety aspects, maybe it’s time to find a new community event.
Why not a street take over of bicycles? How about meeting up at a third space like a park, bar or cafe? What about collectively doing some tactical urbanism to improve your community - paint some crosswalks, add bollards to force pedestrianization.
It is likely not worth your effort as whatever you come up with will likely result in discord deactivating your account for breaking their ToS, or them breaking their API forcing you to constantly play catch-up.
This is why open communication protocols are so important. Email is still as ubiquitous as it is because it’s a protocol, not an API.
I personally think it would be less overall effort to get your friends to switch to an open protocol like matrix, or XMPP than it would playing cat and mouse with proprietary APIs. But you do you, I wish you the best of luck!