Add provisional tech day 2 & 3 dates for Southampton
Add info on kit to Bristol tech day event pages

Change-Id: I10439795a6eb708fd2eb93ccae9d4450ed0b539c
Soton tech day 2 isn't provisional any more.

There's at least a room booking for B25/1009
Copy soton tech day 1 event page to tech day 2.

This is so that there's a readable diff between the two days, see the
next commit.
Update tech day 2 page with latest details.

Change-Id: I936812c450d044df502f28710929a8d008d41559
Update key dates page for concrete tech day date
Link tech day line on front page to events page.

Change-Id: Id586c5e8beb3445fbdc13aa504261dc7d477da0b
Merge "Soton tech day 2 isn't provisional any more."
Merge "Copy soton tech day 1 event page to tech day 2."
Merge "Update tech day 2 page with latest details."
Merge "Link tech day line on front page to events page."
Merge "Update key dates page for concrete tech day date"