Five Things You Need to Know Today: May 30

1. A 30 percent chance of showers, the National Weather Service tells usostly after 11 a.m. Highs of 80ºF, and lows of 60ºF. 

2. Want to pick up some books on the cheap? Well, then perhaps you ought to peruse the selection at the . Running all day at, you guessed it, the , in the auditorium. Most books will be about $1.  

3. Celebrate spring at the  today! Yes, a fair! Everything you would expect a fair to have: rides, games, face painting, tickets, the whole nine yards. Begins at 4 p.m., and tickets cost $1 apiece. 

4.  is running today. The classes will run for eight weeks, from July 8 to August 26 at the Shady Hill School in Cambridge (56 Coolidge Ave). The class costs $200. 

5. Not all memory conditions are Alzheimer's disease.  welcomes Dr. Janet Lawrence, a geriatric psychiatrist at St. Lawrence Hospital to talk about "?" at 9 p.m. tonight.