Moderators have the ability to create community events, which show up in the highlighted box on the front page along with featured meta posts and sometimes other posts. Currently, community events can link only to URLs in the Stack Exchange network.
I think we can trust moderators with a little more freedom than that. Please allow us to link anywhere from community events. The proximate cause of this request is community blogs, which Stack Exchange will no longer host -- we'd like to be able to easily highlight new posts without creating and featuring a new meta post for each one. (On Worldbuilding and I think Science Fiction and Fantasy, that would have meant 40+ such meta posts just in the last year.)
I imagine that there are other uses for off-site links for community events. Space could use them for launches (which they currently track via chat events), for example.
We trust moderators to handle much more sensitive tasks than community events. We're not at risk of spamming here. Could we please open this up?