If you’re sitting inside on the glorious spring day, you might consider taking a walk across the street to Palmer and enjoying the street fair that’s going on this afternoon: http://howlmag.com/events-lowell-ma/lowell-summer-kick-off-party-2/
There’s also a whole list of other stuff to do at http://howlmag.com/events-in-lowell-ma/today/
And Howl Magazine seems to have totally missed the Greek Festival: http://www.greekboston.com/event/festival-lowell-ma/