So far, parking seems to be pretty easy to find at Rivendell. The side streets do not require permits, and there is free parking at the Senn High School Lot a few blocks away.
The closest el stop is Bryn Mawr on the red line. Walk west to Broadway, then northwest up Ridge to 5779. Convenient bus stops are at Broadway and Bryn Mawr, or Clark and Ridge.
There is also free parking at the Senn High School lot, which can ONLY be accessed from Thorndale, a one-way street running west. You can turn onto Thorndale from Broadway, just north of Moody’s Pub, or go north on Glenwood just east of Rivendell, and turn left onto Thorndale.