Jacob is correct that the audience is somewhat of a mystery (though we do know quite a bit about them), but incorrect that this leaves us unable to answer your question.
The New Covenant believers addressed in Hebrews met in homes (as did every other New Covenant congregation prior to the 3rd century). They met over a meal, sometimes called the "love feast", "the Lord's supper", or "the table of the Lord". This was a covenant meal. Over the course of a couple thousand years this morphed into what we now know as "communion" (a crouton and juice snack consumed in a local "church" building), but in the first century it was a meal taken together in homes.
It is true that the very first Jewish converts continued to go to the synagogue as well for the very short period of history that they were allowed, but this was not the gathering of the New Covenant community; it was more transitional and evangelistic in nature. To these early converts, synagogue participation did not replace the gathering of the New Covenant community; it was a separate activity, and so they also gathered regularly with fellow New Covenant believers (in homes, over a meal.)
It is the gathering of the New Covenant community (which took place over a meal in homes) that the author of Hebrews is referring to.
Note that this does not necessarily answer the question of whether New Covenant believers today should also meet in homes over a meal; it simply answers the question of what the gathering of the New Covenant community in the first century looked like.