Party Conferences are a good place to picket, imaginatively:
There's Media saturation coverage, not London-centric but a good spread across the country; exposure to constituency activists, councillors, and MPs. A good picket/demonstration may prove to be a welcome distraction from the interminable Brexit impasse.
Every single party supports the trans ideology. All of them. Their supporters may think differently.
Lib Dems - end of September in Brighton
Labour - third week in September, Liverpool
Conservative - end of September, Birmingham
Green Party, first week October, Bristol
Womens Equality Party, early September, Kettering
Plaid Cymru - tba
TUC - early Sept Manchester
(No Autumn Conferences in Scotland that I know of - they are in the Spring)
UKIP - cubicle 2, gents lavatories, behind the bike sheds.... nah, only kidding.
Suffragette sashes, leaflets and stickers would be needed soonish. And street perfomers. And boyfriends in drag. Sorry, getting carried away......