@bookie.command()<EOL>@click.argument("<STR_LIT>")<EOL>@click.pass_context<EOL>@onlineChain<EOL>def bmgs(ctx, event):
eg = Event(event, peerplays_instance=ctx.peerplays)<EOL>click.echo(pretty_print(eg.bettingmarketgroups, ctx=ctx))<EOL>
[bookie] List betting market groups for an event

        :param str event: Event id