Actually, “a few months after the Comp” is not bad timing, especially if you announce and promote it during the Comp when a lot of the community is engaged, and often people get the bug to write something if they’re not participating, especially if it’s short. Ectocomp I’m sure benefits from a lot of people getting the urge to submit something with it’s lower-stakes buy in and time-commitment for both categories. And SGS has an advantage that entries need not be horror/seasonal-themed.
Let us know if you need help! When you post the announcement we can pin it for you, and I’d recommend entering “event” code in the initial post for the comp duration (under the gear - you only have the option to include an event in the original post) and that code will put make it visible on the site calendar.