Our Multnomah County Library is 150 years old and is throwing a party Saturday. Get on down to Central Library from 11 a.m. to 5 p.m. to partake in the celebration. Inside and outside (on an outdoor stage) there will be music, dance, poetry and opera. Take a tour, visit the ecoroof, learn about 3-D printing, try your hand at calligraphy, look at rare books . . . you can even get your bike repaired. What a library! Happy Birthday, old girl.