Where can I see some pictures from previous Sproutlore/Order of the Golden Sprout events?

Well, there's quite a few on various sites around this here interweb; among them are the following:

If you hunt around on Brighton Rock, you'll also find pics from the Pagan wedding of Tim and Loz McGregor that Robert officiated at, and the Brighton rock club he opened (The Engine Room)

There's also loads of pics on various people's facebook accounts. If you wanna see those, join the club, chat to the people, they'll soon add you as friend on the FB.