The big event taking place around the city this weekend is Open House NY. OHNY celebrates the city’s architecture and design during the annual big weekend, but programs run throughout the year.OHNY kicks off with a launch party tonight which is $40 in advance or $50 at the door. The Saturday and Sunday events are free to the public unless you don’t feel like standing in line with the plebs, in which case you can purchase a “passport” for $150.There are tours of historic and architectural sites, concerts and dance performances, sustainability workshops and events for children. See the website for more info.And speaking of open houses, don’t forget that Crown Heights North tour I told you about!Art Obama is a silent auction taking place tonight in the South Slope. Space is limited and pre-registration is suggested, so I may be posting too late. You can still try to get in at the door for $25.Works by over 100 artists will be auctioned off to support the Obama campaign and other Democrats. This all goes down between 7pm-10pm. Links to artists on the website.