To do this weekend:

Ever wondered what it looked like inside the McCarren Park pool in Williamsburg? Now’s your chance to find out. Check out Agora while the weather is still nice. Click here for more info about Agora.
Also, as mentioned before (and apparently we are the only New York blog covering this) the antiwar rally and concert takes place in DC on Saturday. The free concert will feature:
3:50 PM – Wayne Kramer and the Bellrays
4:41 PM – Steve Earle
5:31 PM – The Coup
6:23 PM – Sweet Honey in the Rock
7:09 PM – The Evens (Ian from The Make-Up)
7:54 PM – Ted Leo+Pharmacists
8:50 PM – Head Roc
9:37 PM – Thievery Corporation
10:59 PM – Pure Belly Dance
11:27 PM – Bouncing Souls
12:12 AM – Le Tigre
Head on down if you can. The bus is 25 bucks.