Tuesday June 7th California, Montana, New Mexico, South Dakota and New Jersey will hold the majority of the remaining contests in the presidential primary (the final Democrat race is Washington DC on June 14th).
The key prize being targeted by Senator Bernie Sanders next Tuesday is California with 548 total delegates at stake.  With a California win Sanders hopes to carry his efforts into a contested convention:

(Via AP) Speaking to reporters in Los Angeles Saturday, the Sanders said that the Democratic National Convention will be contested, predicting that the winner of the Democratic nomination will need to rely on super delegates to reach the magic number. He called the nomination process “deeply flawed,” adding that whether he wins the nomination or not, he will do everything he can to change it. (link)

However, Sanders will more than likely run up against the Clinton DNC and Media machine early in the evening next Tuesday.    All indications are Hillary will likely win New Jersey, with polls closing first at 8:00pm EDT, which will immediately kick off several prime time hours of the MSM spontaneously calling Hillary Clinton “the presumptive nominee”. 
During the course of the three hours between polls closing in NJ (8pm EDT) and polls closing in California (8pm Local / 11pm EDT) team Sanders is going to run up against a well coordinated and united front.
The goal of the Clinton/Media effort will be to dispatch any thought of Sanders momentum, and put a halt to any further encroachment on Hillary’s anointment regardless of the California outcome.
Bernie Sanders may genuinely and reasonably envision a contested convention as an outcome of neither candidate surpassing the required delegate thresholds via voters and voted delegate distributions.  But predictably Sanders is going to be ground up by the party machine and the professional party insiders (super delegates) who will never allow Hillary to be factually challenged for the nomination.