OK here's the summary so far:
When: Sat, June 5 at 10am
Where: Corner of Beacon St and Charles St, standing on the corner of the Commons itself.
Hancock observatory sounds a lot of fun to me. I live a few minutes walk from that building, have taken a number of pictures of it from ground level, but have never been to the top!
Anyway, sounds great. Looking forward to meeting whoever makes it...