Relative complexe form line (TextFormField-TextField- in a Row) with Flutter (Dart)

eventform.dart

import 'package:flutter/material.dart';

class EventForm extends StatefulWidget {
  @override
  _EventFormState createState() => _EventFormState();
}

class _EventFormState extends State<EventForm> {
  static GlobalKey<FormState> _eventformKey = GlobalKey<FormState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.white,
      appBar: AppBar(
        title: Text('Create an event'),
        centerTitle: true,
      ),
      body: Container(
        decoration: BoxDecoration(
          border: Border.all(
            color: Color(0xFF263238),
            width: 1.1,
          ),
        ),
        child: SingleChildScrollView(
          child: Padding(
            padding: EdgeInsets.all(10.0),
            child: Column(
              children: <Widget>[
                Form(
                  key: _eventformKey,
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: <Widget>[
                      TextFormField(
                        decoration: const InputDecoration(
                          icon: Icon(Icons.calendar_today),
                          hintText: 'Title of the event',
                          labelText: 'Title *',
                        ),
                        validator: (value) {
                          if (value.isEmpty) {
                            return '';
                          }
                          return null;
                        },
                      ),
                      TextFormField(
                        decoration: const InputDecoration(
                          icon: Icon(Icons.location_on),
                          hintText: 'Complete address of the event',
                          labelText: 'Address *',
                        ),
                        validator: (value) {
                          if (value.isEmpty) {
                            return '';
                          }
                          return null;
                        },
                      ),
                      Container(
                        padding: EdgeInsets.only(top: 10.0),
                        child: Row(
                          children: <Widget>[
                            Expanded(
                              child: Padding(
                                padding: const EdgeInsets.all(5.0),
                                child: Icon(
                                  Icons.access_time,
                                ),
                              ),
                            ),
                            Expanded(child: Text(' From ')),
                            Expanded(
                              flex: 3,
                              child: Column(
                                mainAxisSize: MainAxisSize.min,
                                children: <Widget>[
                                  TextFormField(
                                    decoration: const InputDecoration(
                                      hintText: 'Date',
                                    ),
                                    validator: (value) {
                                      if (value.isEmpty) {
                                        return '';
                                      }
                                      return null;
                                    },
                                  ),
                                  Container(
                                    padding: EdgeInsets.only(top: 10.0),
                                    child: Text('at'),
                                  ),
                                  TextFormField(
                                    decoration: const InputDecoration(
                                      hintText: 'Hour',
                                    ),
                                    validator: (value) {
                                      if (value.isEmpty) {
                                        return '';
                                      }
                                      return null;
                                    },
                                  ),
                                ],
                              ),
                            ),
                            Expanded(child: Text(' To ')),
                            Expanded(
                              flex: 3,
                              child: Column(
                                mainAxisSize: MainAxisSize.min,
                                children: <Widget>[
                                  TextFormField(
                                    decoration: const InputDecoration(
                                      hintText: 'Date',
                                    ),
                                    validator: (value) {
                                      if (value.isEmpty) {
                                        return '';
                                      }
                                      return null;
                                    },
                                  ),
                                  Container(
                                    padding: EdgeInsets.only(top: 10.0),
                                    child: Text('at'),
                                  ),
                                  TextFormField(
                                    decoration: const InputDecoration(
                                      hintText: 'Hour',
                                    ),
                                    validator: (value) {
                                      if (value.isEmpty) {
                                        return '';
                                      }
                                      return null;
                                    },
                                  ),
                                ],
                              ),
                            ),
                          ],
                        ),
                      ),
                      Padding(
                        padding: const EdgeInsets.symmetric(vertical: 16.0),
                        child: RaisedButton(
                          onPressed: () {
                            // Validate will return true if the form is valid, or false if
                            // the form is invalid.
                            if (_eventformKey.currentState.validate()) {
                              // Process data.
                            }
                          },
                          child: Text('Submit'),
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}