As is often the case, Snopes has already looked at this.
A large march in Poland did take place on 11th November 2015, but it was well reported in mainstream media. Numbers were less than 150,000 and not all were protesting Muslim immigration.
Reports on the attendance at the march vary, with organizers claiming 50,000, and police 25,000.
The march was widely reported:
Social media claims about the marches in Poland further held that the events were ignored or purposely covered up by Europe’s mainstream media. That was easily proved false, as Britain’s Telegraph (“EU flag burned as tens of thousands join Warsaw nationalist demo”), Russia’s RT (“‘Communists will be hanging’: Nationalist march commemorates Poland’s Independence Day”), Financial Times (“Polish nationalists rail against Brussels in show of strength”), Radio Poland (“Poland commemorates Independence Day”), Bloomberg (“Thousands March on Independence Day as Police Converge on Warsaw”), Britain’s Express (“EU flag burned as thousands join nationalist march in Poland”), and U.S. News & World Report (“Polish extreme nationalists hold large anti-migrant march on Independence Day”) all covered the rally on or around 11 November 2015.
The Snopes article gives links to the media reports.
The march was in celebration of Polish independence. While there was a distinct anti-EU theme to the march, not all were protesting Muslim immigration specifically.