<p>The older organizations on campus (like the Crimson, Advocate, band, etc) own their own rooms and buildings. For the groups I’ve involved with, we either meet in House common space or the place where we carry out our activities. If the activity involves students outside of Harvard (ex tutoring high school kids), you can meet in classrooms or reserve computer labs. Or, I guess, you can meet in someone’s room?</p>
<p>Edit: Technically, each officially recognized organization also owns a room in SOCH (<a href=“http://osl.fas.harvard.edu/icb/icb.do?keyword=k65178&tabgroupid=icb.tabgroup96869[/url]”>http://osl.fas.harvard.edu/icb/icb.do?keyword=k65178&tabgroupid=icb.tabgroup96869</a>), which is sort of like the activity center in the traditional sense, but because the place is kind of far, most people opt to have their meetings in different Houses instead.</p>