if it's your night - you have a vested interest in it, you need permission from the Mods (and usually offer deals for urbanites). if it's people just planning to go to something or letting people know about something that sounds interesting, it's not spam because they don't stand to gain.
i know sometimes the boundaries can be vague but all harry needed to do was check
i know sometimes the boundaries can be vague but all harry needed to do was check


