Two councils have issued extra guidance on holding street parties after the prime minister urged residents not to be put off by "petty bureaucracy".
David Cameron warned authorities on Monday "not to interfere" with street party plans on the royal wedding day.
Adur and Worthing councils in West Sussex said their official deadline for road closure applications was 31 March.
They have issued additional health and safety information in the light of Mr Cameron's comments, a spokeswoman said.
They said they wanted to encourage residents to hold parties but they should discuss it with officers first.
Mr Cameron said there would be a street party in Downing Street on 29 April, a day which would be a "chance [to]... celebrate the great things about our country".
He said reports of "petty bureaucracy" should not put people off holding their own.
Closures for parties
The government has relaxed red tape to make it easier for people to organise a street party or fete.
Worthing and Adur councils said they had been notified of 31 royal wedding street parties in their districts.
Closure orders for parties on public roads had been granted but some events were on private land or in town centre precincts, it added.
"We have not been bureaucratic here," said spokeswoman Wendy Knight.
They warned that the public cannot legally stop vehicles entering or driving down a road unless a road closure is in place.
But they said council, highways and police officers would be willing to discuss party requirements and give advice.
Insurance can be arranged through the council, at a cost of £63.60.