Adam Schefter via the Twitter this morning:
FWIW: League sent memo to teams last night, advising them to be prepared to stay overnight during next Tuesday's NFL meetings in Chicago.
RT @NowUknow27: What's the meaning of this? ... Means league knows it's entering critical stretch and there's plenty to discuss. Good sign.
RT @ProFootballTalk: June 21 emerges as a potentially key date in labor talks
Some GM's believe a new CBA will be voted on June 21/22nd. Doesn't mean it gets approval, but teams could vote on CBA next week.