General Liability Insurance

via InsuranceForNonProfits.org: "This is typically the "core" coverage for a nonprofit. Most commercial general liability insurance provides coverage for a wide range of acts or offenses which result in bodily injury, personal injury, advertising injury or property damage to a third party. The most common type of incident covered by this policy is a "slip and fall". Commercial general liability (often referred to as CGL or GL) insurance is generally available as an "occurrence" policy, which provides significant advantages over a "claims-made" policy.

A general liability policy may also extend to special events. If your organization conducts any type of special events, you should make sure that your general liability policy includes special events and that you follow any requirements about providing notice of special events."

Talking Points

All-ages meeting area separate from workshop area.
Anyone under 18 accompanied by an adult guardian.
No seriously dangerous tools in the space.

Underwriter Paragraph

Just a draft of key points to make, please prettify the language:

Sudo Room is a non-profit membership organization that provides work space and meeting space for members and their guests, as well as access to tools and materials for creative and technical projects. Member projects and workshops are artistic, scientific, and educational in nature, Activities include 3D printing; audio production, recording and broadcasting; painting and sculpture; electronics assembly and soldering; and computer programming. Events include talks, lectures, workshops and presentations in a clean, safe space.

Quotes

Requested from https://www.niac.org on 10/27/13 [Jenny]
Requested from http://prosightspecialty.com/ [Craig]

References

General Liability Insurance
https://www.noisebridge.net/wiki/InsuranceQuestions
Hackerspace legal formation and insurance thread on hackerspaces.org
insurance thread on hackerspaces.org
insurance questions for a US-based space? thread on hackerspaces.org
Article on obtaining insurance for makerspaces