PRESERVING Boston Common should mean much more than keeping the grass green ("Large events may become uncommon at city's beloved park," Page B1, March 20). The Common was America 's very first public grounds and the city should not regulate away the right of the people to assemble peaceably there for the sake of a greener lawn. If greener grass is what the city wants, they can achieve that by not allowing dogs to urinate on the grounds. Boston Parks Department maintenance people have told anyone who asks that dog urine, not peaceable assemblies, is what damages the grass most.

The T Riders Union (TRU), a public transit riders advocacy group, is holding a rally in front of the State House tomorrow to protest the T's ballooning debt that keeps shoveling the burden onto riders in the form of 3 fare hikes in 6 years.

Riders calling for the State legislature to pass MBTA debt relief legislation and will be joined by co-sponsors of the bill (Representatives Carl Sciortino, Liz Malia, and Brian Wallace.)

It'll be a fun rally complete with political theatre and a rider being "crushed" by a massive weight with "MBTA debt" written on the sides.