Drupal 7.x

Hi everyone

I'm trying to update nodes programmatically. These nodes have field based on "node reference" module with multiple select.

( ! ) Fatal error: Maximum execution time of 30 seconds exceeded in C:\wamp\www\drupal-7.73\includes\file.inc on line 1992
Call Stack
# Time Memory Function Location
1 0.0016 368624 {main}( ) ..\index.php:0
2 0.0061 908896 drupal_bootstrap( ) ..\index.php:20
3 0.1137 3931208 _drupal_bootstrap_full( ) ..\bootstrap.inc:1912
4 7.3722 23850240 module_invoke_all( ) ..\common.inc:4947
5 7.4191 24462336 call_user_func_array ( ) ..\module.inc:819
6 7.4191 24462472 rules_init( ) ..\module.inc:0
7 7.4237 24507096 rules_invoke_event( ) ..\rules.module:26
8 7.4237 24507320 rules_get_cache( ) ..\rules.module:776
9 7.4779 24508128 rules_get_cache( ) ..\rules.module:232
10 7.4781 24508288 _rules_rebuild_cache( ) ..\rules.module:239
11 20.5989 26776120 RulesAbstractPlugin->rebuildCache( ) ..\rules.module:260
12 23.8862 28009512 rules_fetch_data( ) ..\rules.core.inc:1305
13 27.1978 28085120 drupal_alter( ) ..\rules.module:207
14 27.1978 28085440 module_implements( ) ..\module.inc:938
15 29.9723 28091512 module_load_include( ) ..\module.inc:677
16 29.9723 28091600 drupal_get_path( ) ..\module.inc:300
17 29.9723 28091600 drupal_get_filename( ) ..\common.inc:2671
18 29.9728 28091952 drupal_system_listing( ) ..\bootstrap.inc:691
19 29.9729 28092688 file_scan_directory( ) ..\common.inc:5162
20 29.9956 28100200 file_scan_directory( ) ..\file.inc:1994

Hello,

I am still trying to get my student nodes under the related class. I now have all the students under every class page. But I only want the students of THAT class under the class node.

So I think I have to set up an argument in views. (I also think its not called arguments anymore)

But I don't know what argument. Does anybody have an idea?

I am looking to develop a website for events so that users can register for seminars etc. Once registered on an event, I'd like users to be sent a automated Calendar Appointment and followed by an email reminder closer to the time. Is this possible? I had a quick look through some modules but couldn't find anything completely relevant.
I am new to this so any assistance will be greatly appreciated.

I am likely going to have a Drupal 7 site developed shortly and would like to know, does it include a polls module or even have the option of adding one? We'd like to be able to take polls on our website either as part of an article or just on it's own and then be able to display results.

Hello,
I have hired a developer a few months ago that began developing a website for us that is using Expression Engine 2.x. We really liked Expression Engine so had chose that platform but recently he informed us that we should look at Drupal 7 instead. Part is he said it is better for business websites such as ours and is more flexible and the future looks bright for Drupal and there's more options with getting it to work on Mobile Devices.