Thames Valley and the Mount both scored again in the second spell, but Thames Valley emerged with the 3-2 win and a berth in the women's final.
The men's semifinals were both played at Hamilton, with two periods of golden goal extra-time needed for Suburbs to despatch Fraser Tech 4-3 in the first semi, then 2015 winners Hamilton Old Boys triumphed 2-0 over Te Awamutu in the second semi.
At Tauranga it was a local derby between Bayleys Otumoetai and Tauranga Old Boys for fifth place.
Leading 2-1 at the turn, Otumoetai applied increasing pressure on Old Boys' defence and goals resulted at regular intervals in the second half.
All three members of the Bruin family got their names on the scoresheet, first with Tyler then Hayden and Cory each scoring for Otumoetai in their 5-2 victory.
The Intercity women's and men's finals will be held at the Tauranga Hockey Centre on Saturday, with the women's final at 2pm and the men's final at 3.30pm, preceded by the match for the men's plate at 12.30pm.