big, huge, large, major, mass, massive
public
indoor, outdoor
a massive outdoor rally in Buenos Aires

pep (AmE)
a pep rally before the homecoming game

campaign (esp. AmE), election (esp. BrE), political
opposition, protest
peace
anti-government, anti-war, etc.
pro-government, pro-war, etc.

have, hold, stage
The demonstrators marched to Trafalgar Square where they held a rally.

call for, organize, plan
attend, take part in
About 5 000 people attended a rally calling for peace.

address, speak at
ban
The government banned all rallies.

take place
end
call for sth
a rally calling for a boycott of the January elections

at a/the rally
She spoke at a public rally in Hyde Park.

rally against
a mass rally against the treaty

rally for
a rally for the winning candidate

rally in support of
a rally in support of the strike

bear-market, market, stock-market (all business)
The US dollar is now ending its bear-market rally.

dollar, euro, etc.
recent
late
The visiting team staged a late rally.

mount, stage

rally in
the recent rally in the Treasury market

long, short

play
win
lose

club, international
motor, motorcycle

hold, organize
compete in, enter
win

circuit
driver, driving

on a/the rally
He will join the team on the rally next week.