Crusty, you are correct. I've only been able to confirm that there is a weekly Muslim prayer meeting on Capital Hill, sponsored by a congressman - the one in the link IG posted above. Its a program of official record as its sponsored by an official, so Congressional records are available to validate.
However, while Obama has celebrated Rammadan in his house (a practice started by Bush), a Seder, Christmas, etc., he has broken with the tradition observed by numerous predcessors, and specifically did not host a National Day of Prayer ceremony at the White House. This seems odd, since a National Day of Prayer per the Congressional act is inherently ecumenical, i.e. accepting of all faiths, while the individual events above are very much faith specific. And in his proclamation this year he indicated that prayer ought to be personal, yet at each of the events hosted in his home, prayers specific to the faith were offered publicly & corporately (contrary to his proclamation). So I must revise my previous conclusions.
1. The President has made the National Day of Prayer a matter of personal privacy.
2. This is different than administrations in the past.
3. The President has celebrated religious observances and public prayer from several faiths in his home.
4. The President will not host an event which would unify those same faiths in his home.
This reaffirms my belief that he is in fact a Deist (Moral Therapeutic type), but he is not really interested in harmony between faiths. Again, how is this an equitable application of the establishment clause?