To add the CSS file I've used: https://wordpress.org/plugins/simple-custom-css/ to add PHP Snippets: https://wordpress.org/plugins/code-snippets/

add-speakers-on-the-schedule.php

<?php
add_action( 'tribe_template_after_include:events/v2/day/event/venue', static function ( $file, $name, $template ) {
	$event = $template->get( 'event' );
	if ( ! $event ) {
		return;
	}
	
	if ( ! $event->organizers ) {
		return;
	}
	
	if ( ! $event->organizers->count() ) {
		return;
	}
	
	foreach ( $event->organizers as $organizer ) : 
		$organizer_html = tribe_get_organizer_link( $organizer );
	?>
<div class="tribe-events-calendar-day__event-organizer">
	<?php echo $organizer_html; ?>
</div>
	<?php
	endforeach;
}, 15, 3 );

extra-styles.css

.tribe-common .tribe-events-c-search__button {
	margin-right: var(--tec-spacer-2);
}

.tribe-common .tribe-events-c-subscribe-dropdown__button {
	background: var(--global-palette-btn-bg);
	color: var(--global-palette-btn);
}

.tribe-common .tribe-events-c-subscribe-dropdown__button:hover {
	color: var(--global-palette-btn-hover);
	background: var(--global-palette-btn-bg-hover);
}

.tribe-common .tribe-events-c-subscribe-dropdown__button button {
	background: transparent;
}


@media only screen and (min-width: 768px) {
	.tribe-block__venue.tribe-block__venue--has-map .tribe-block__venue__map {
		width: 62%;
	}
}

.tribe-common--breakpoint-medium.tribe-events .tribe-events-calendar-day__event ~ .tribe-events-calendar-day__event {
	float:left;
	width: 50%;
}

.tribe-common--breakpoint-medium.tribe-events .tribe-events-calendar-day__event-details {
	width: calc(var(--tec-grid-width-1-of-8)*8);
}
.tribe-common--breakpoint-medium.tribe-events .tribe-events-calendar-day__time-separator + .tribe-events-calendar-day__event, 
.tribe-common--breakpoint-medium.tribe-events .tribe-events-calendar-day__type-separator + .tribe-events-calendar-day__event {
	margin-top: var(--tec-spacer-9);
}

.postid-1521 .tribe-events-before-html,
.tribe-common--breakpoint-medium.tribe-events .tec-buy-ticket-mobile {
	display: none;
}

.tribe-common .tribe-events-before-html h2 {
	margin-bottom:var(--tec-spacer-4);
}

.tribe-events-view.tribe-events .tribe-events-header {
	margin-top: var(--tec-spacer-6);
}

.tribe-common--breakpoint-medium.tribe-events .tribe-events-calendar-day__event::before {
	width: auto;
}

.tribe-events-calendar-day__time-separator,
.tribe-events-c-subscribe-dropdown {
	clear:both;
}

.tribe-events-c-small-cta__price {
	display:none;
}

.tribe-block__venue {
	padding: 15px 0;
}

.tribe-block__venue .tribe-block__venue__meta {
	margin-bottom: 0;	
}

.tribe-block__venue .tribe-block__venue__meta .tribe-block__venue__name h3 {
	font-size: var(--tec-font-size-5);
}

.tribe-block__organizer__details {
	margin-bottom: 0;
	padding: 15px 0;
}

#legend_box {
	font-size: 16px;
}

.tribe-block__organizer__details h3 {
	font-size: var(--tec-font-size-5);
}

.tribe-blocks-editor .event-tickets .tribe-tickets__rsvp-wrapper {
	max-width: none;	
}

.tribe-events-view:before,
.tribe-events-view:after {
  content: "";
  display: table;
} 
.tribe-events-view:after {
  clear: both;
}
.tribe-events-view {
  zoom: 1; /* For IE 6/7 (trigger hasLayout) */
}

hide-calendar-elements.phpp

<?php
add_filter( 'tribe_template_html:events/v2/components/events-bar/views', '__return_empty_string' );
add_filter( 'tribe_template_html:events/v2/day/nav', '__return_empty_string' );
add_filter( 'tribe_template_include_html:events/v2/day/top-bar', '__return_empty_string' );
add_filter( 'tribe_template_html:events/v2/day/event/cost', '__return_empty_string' );

modify-event-labels-to-conference.php

<?php
add_filter( 'tribe_event_label_singular', static function() {
	return __( 'Talk', 'jp-custom' );
} );
add_filter( 'tribe_event_label_singular_lowercase', static function() {
	return __( 'talk', 'jp-custom' );
} );
add_filter( 'tribe_event_label_plural', static function() {
	return __( 'Talks', 'jp-custom' );
} );
add_filter( 'tribe_event_label_plural_lowercase', static function() {
	return __( 'talks', 'jp-custom' );
} );

modify-single-talks-elements.php

<?php
add_filter( 'tribe_get_organizer', static function ( $organizer_html ) {
	return esc_html__( 'Speaker: ', 'jp-conference' ) . $organizer_html;
}, 15 );

add_filter( 'tribe_get_venue', static function ( $venue_html ) {
	return esc_html__( 'Track: ', 'jp-conference' ) . $venue_html;
}, 15 );

add_filter( 'tribe_template_html:tickets/v2/rsvp', static function( $html ) {
	if ( ! is_user_logged_in() ) {
		return '';
	}
	
	$user_id = get_current_user_id();
	$attendee = tec_tc_attendees()->by_args( [
		'user_id' => $user_id,
		'event_id' => 1521,
		'status' => 'publish',
	] )->first();
	
	// No Ticket sold for the main event.
	if ( ! $attendee ) {
		return '';
	}
	
	return $html;
}, 15 );

redirect-all-events-to-day-of-conf.ph

<?php
add_action( 'template_redirect', static function() {
	$context = tribe_context();
	if ( ! $context->is( 'tec_post_type' ) ) {
		return;		
	}
	$view = $context->get( 'view' );
	if ( empty( $view ) ) {
		return;
	}
	
	$conference_day_url = tribe_events_get_url( [ 'eventDisplay' => 'day', 'eventDate' => '2022-01-10' ] );
	
	if ( 'single-event' === $view ) {
		return;
	}
	
	if ( ! in_array( $view, [ 'single-event', 'day', 'default' ], true ) ) {
		remove_filter( 'wp_redirect', [ tribe( 'events.views.v2.hooks' ), 'filter_redirect_canonical' ] );
		wp_redirect( $conference_day_url );
		exit;
	}
	
	$date = $context->get( 'event_date' );
	if ( '2022-01-10' !== $date ) {
		remove_filter( 'wp_redirect', [ tribe( 'events.views.v2.hooks' ), 'filter_redirect_canonical' ] );
		wp_redirect( $conference_day_url );
		exit;
	}
} );

remove-main-event-from-day-view.php

<?php
add_filter( 'tribe_events_views_v2_view_day_repository_args', static function( $repository_args, $context, $view ) {
	$repository_args['post__not_in'] = [ 1521 ];
	
	return $repository_args;
}, 15, 3 );